What does a DJ do?What DJs are doing when they perform

Mistakes DJs make and how to avoid them

You’re asking the very same question many have before you. What is it a DJ actually does?

Whether you’re just curious, or you’re a newbie or veteran DJ. Chances are you’ve found this article because you want a clear definition of what a DJ is, what makes a good DJ in 2021 and maybe just want is it that bad DJs keep doing wrong.

Maybe you think DJ-ing is easy or you’re keen to find out whether its something you could do. You’ve come to the right place!  We cover all these questions and more in this article. So let’s get going!



Table of contents

  1. The definition of a DJ
  2. What DJs used to do
  3. What DJs do now
  4. How DJs mix songs
  5. What equipment DJs use
  6. What software DJs use
  7. What types of DJs are there?
  8. What some DJs get wrong
  9. Fake DJs vs world class DJs
  10. Celebrity DJs
  11. What a great DJ should do

Firstly lets tackle what a DJ actually is and what it even means!

Definition of a DJDJ stands for “Disk Jockey” as once upon a time all DJs used vinyl records spinning on turntables. Jockeying the plastic disks to synchronise the beats and play appealing music to a crowd.

But that really doesn’t define what a DJ is in enough detail. A DJ is someone who plays music to a crowd, be they in person in a nightclub or venue at an event, or broadcast over radio, cable or these days the internet. DJs are entertainers that (usually) don’t sing and (usually) don’t play musical instruments, providing a constant pace of music from recordings.

How does that sound? Adding a little meat to the bones of what a DJ is right! But there’s a lot more to cover.

A DJ is expected to know their music well, know how to entertain a crowd and the type of music they are expecting. Modern DJs should be technically competent with the hardware and software they need to use to make DJ-ing possible, and they should be confident enough to perform to their audience.

This is all a great summary of what a DJ is but to understand what a DJ does on stage we need to dig a little deeper and understand where DJ-ing came from and where its currently at.


So let’s get to grips with a little history lesson. What is it DJs used to do?

When DJ-ing as an art form first appeared it was nothing more than wiring two vinyl playing turntables to a studio mixer that offered the ability to play both tracks at the same time. This meant it was now possible to blend two tracks together, transition between them and create a continuous rhythm without the need for any “dead air” or silent moments that could kill the mood.

It was a game changer and it brought about a whole new type of nightclub where DJs could be creative and create “sets” of music that would compliment each other and entertain the crowd.

Vinyl was king back then and turntable manufacturers got in on the craze, creating record players that could adjust the speed of the platter, slowing down or speeding up the song in order to synchronise the beats.

It’s safe to say this ability to “beat match” created multiple dance music genres where types music would stick within a particular range of beats per minute (BPM) so that they could be mixed with other tracks within the genre. This is why house music is generally around 120-130 BPM, Trance is around 130-140 BPM and Drum & Bass is around 170 – 180 BPM.

Technics SL1210 Mk2Back then DJ turntables like the legendary Technics 1200 and 1210 were a must and allowed for 8% pitch shift either side of the tracks original recording at either 33 or 45 RPM (rotations per minute of the turntable). Knowing how to beat match and do it well was the ultimate ability of a night club DJ, in fact we’ve written an article on why learning to beat match is still important. For wedding and even radio DJs the music is generally played at its original

Vinyl turntables, coupled with soft fluffy “slip mats” allowed the record to be held easily with just the touch of your fingers, moving it back and forth to create new “scratch” sounds. From this simple ability scratch mixing was born and is still very much alive and kicking decades later. Although it’s far from simple to do it well. More on that later!

Check out this amazing how to video from 1983 featuring the absolute legend that is DJ Grandmaster Flash.

The art of DJ-ing created musical genres, new devices to control recordings and mix with too. Over the years its become ever more technical but no less creative. So let’s explore just what a DJ does these days.


denon Prime 4 works with SoundcloudDJ-ing sure has moved on leaps and bounds since its inception in the 70s. Moving from spinning vinyl records to digital formats that can be manipulated and new and exciting ways.

There have been multiple technical breakthroughs that have helped DJ-ing become ever more creative. Some would argue easier depending on personal choice of how you use modern DJ hardware, but there are many skills a DJ needs to have in order to be a great DJ. More on that in a later chapter!

Exactly what a DJ does depends on the type of DJ you’re talking about. But lets assume you’re here because you’ve heard of some famous DJ and you’re wondering what it is a DJ actually does on stage, performing in front of hundreds or thousands of people. Or maybe you’re wondering if you too could become a world famous DJ.

I love this interview with one of my heroes Carl Cox showing just how technical a business being a world class DJ is.

It’s true to say that over the years exactly what this type of DJ does has changed immensely. There are a few things from all eras that DJs still do so lets analyse those first.

A DJ mixes tracks together

Firstly let’s cover the obvious. A DJ is someone what mixes tracks together, that hasn’t changed since the dawn of pitch-shift turntables and dance music types that were made to be mixed. It’s all about creating that seamless vibe that carries the pace and energy with it through an entire set of music.

Just how they transition from one track to another may have changed, but the requirement to try and blend the music and build on the energy of a crowd has always been there and always will.

A DJ tries to be unique

What a DJ does - Be uniqueIts all about the USP baby! Especially if we’re singling out world famous DJs who have very specific characteristics. They may produce their own sounds and DJ with those. They may be known for their scratch mixing abilities, or for DJ-ing with a mask on like Marshmellow and DeadMau5. Whatever their personality its unique amongst other DJs and gets them recognition and more DJ gigs!

Some DJs are known from a particular style of mixing. That can be quick changes or key blending, maybe long sweeping seamless mixes or transitioning between unusual phrases of a song. There’s plenty of ways to be creative and carve a niche.

A DJ knows their crowd

What a DJ does on stageThe best DJs not only know how to mix songs together but importantly, possibly the most importantly, they know what to play. Curating a set of songs to play is quite possibly the most creative and hardest thing to do as a DJ.

It’s all very well knowing how to seamlessly transition between songs, but if the crowd aren’t feeling you’re vibe you’re in trouble!

It doesn’t matter if you’re a wedding DJ or a world famous DJ. Reading the crowd and playing what works best for the time of day, the venue, the energy of the crowd, is what DJ-ing is really all about. It can take years to master this skill and its definitely the most important aspect of any truly great DJ.


So exactly how does a DJ do their thing in 2021? What makes DJ-ing possible in 2021?

While you can still DJ with vinyl, and some people choose to do this, its safe to say things have turned digital, which opens up a whole world of new creativity for DJs. These days most DJs are working with a digital audio file of one format or another. MP3s are possible although usually lower quality than most professional DJs want. WAV files are great for recording sets but less useful for live DJing. Flac or M4A formats are common.

Digital files require a computer so some DJ decks and mixers require a laptop to do all the hard audio processing work, while some DJ controllers have computers built in that can play audio files. Either way its a computer’s job to play back the audio files, adjusting their pitch, adding effects and blending them together. Giving you all the controls you need to be a creative DJ in 2021!

DJ Controllers

What do DJs do?

DJs often use controllers like Pioneer’s DDJ-1000 which features 2 physical decks allowing for 4 virtual decks, lots of controls for volume, effects, loops and beat matching. All those controls at your fingertips mean lots of access to be super creative. Its a far cry from the days when I first started DJ with a simple 2 channel mixer and some vinyl turntables.

So with all these options DJs can be and really are expected to be much more creative and original in 2021. It can seem intimidating at first as you have so much more to do while DJ-ing, but the beauty is in the amazing sounds you can create. Effectively producing a whole new track live on-the-fly as you loop, effect and blend samples together.

Single decks

What DJs do?You can also get singular decks, similar to the vinyl turntables of yesteryear. Allowing you to browse your digital music collection and see in more detail the waveform of the music while you’re looping, sampling and mixing. The Pioneer XDJ series of decks is a great example of this.

Some DJs swear by this approach, the likes of Carl Cox for instance who use 4 of these beasts to create entirely new sounds as he DJs.

So its fair to say that modern DJ-ing is a very technical endeavour. There’s lots of controls to learn, software to master and hardware to purchase! This is why modern DJ-ing is just as hard, if not more so, than in previous, more analog eras.


So we’ve touched on modern DJ-ing in the chapter before this but lets go a little deeper in to all of the hardware DJs use to do what they do.

Decks

DJ DecksWhether its vinyl or CD, digital or otherwise, you still need turntables, even if they don’t actually turn! Still known as “decks” each deck is what controls one singular track, supply audio to other hardware for mixing together. Its much more than just pressing play. Here’s a breakdown of the most important features of any DJ deck.

Pitch shift

Firstly lets cover the one control that makes beat-matching two tracks together possible. the Pitch blend or Pitch shirt (sometimes tempo shift) control is usually a fader style control that by default is set to the middle. It allows you to slow down and speed up a song, with the original tempo being in the middle at zero. Then plus or minus a percentage amount to speed up or slow the track.

Vinyl turntables used to allow 8% pitch shift on turntables like the technics 1210s, and 10% on the original Vestax DJ decks, but modern turntables are software driven so the percentage amount can be personal choice.

These days modern decks also have the option to sync the beats of multiple tracks, taking away the need to manually pitch shift the playing track with this control. But beat-matching is still a very important skill that any DJ worth a damn should be able to do.

Here’s a great video from Christian Jackson on how to use tempo controls.

Adjusting this control in very refined increments is the key to finding the exact BPM of two tracks and mixing them together perfectly.

Cue points and hotcues

Hot cue locationsDifferent manufacturers call them different things but they are all the same thing, exact markers or flags within any given song that you can instantly jump back to whenever you want.

These could also include loops where the deck repeats one section over and over to create a never ending track you can then creatively play with adding effects and adjusting controls to make a new sound.

Whether its a wedding DJ a club DJ or a DJ on a world tour, they all use cue points to quickly jump to important parts of tracks and to get creative with their sounds.

Library browser displays

Library display on DJ controllerSome DJ decks also give you a display to view your music library on, scrolling through to select the next track or sample you want to play. While this used to be exclusively done on a laptop, these days its possible to ditch the laptop altogether and just use a DJ deck to find what you need.

It can get fiddly especially without a physical keyboard but its definitely becoming a popular option on modern DJ equipment.

Mixers

Mixar controllerWhile decks provide the sound of each playing track, there’s still a need for another device to mix these sounds together. DJ mixers are the heart of the DJ gear setup where everything else plugs in and ultimately provides the main audio output for the sound system.

They can be overwhelming pieces of DJ kit because they have duplicated controls for each mixable channel. Providing volume control for each channel as well as the ability to control high, mid and low frequency volumes separately.

This allows DJs to cut the bass from one track and keep the bass from another, blending sounds without two bass-lines overpowering each other.

They also often include controls for added effects like reverb, filters, delay echos and gaters, allowing you to affect the sound of a particular channel in new and creative ways. Some mixers even let you layer one effect on top of the other for super interesting soundscapes.

This is another way modern DJ-ing has change immensely with powerful laptops and built in computers than can process all these effects on-the-fly.

Some mixers can be super simple and cheap too, others can be absolute beasts with what looks like hundreds of controls. Either way its. DJs job to understand how they work and just what they can do with it. This is what DJs must do well in order to be a great DJ.

Music libraries

Rekordbox music library displayIt goes without saying that none of this would be possible without a library of songs to play. This used to be a heavy record-box that vinyl DJs would carry from gig to gig, taking with them just the selection of tracks they needed for their set.

These days it can be USB sticks, external hard drives, laptops with gigabytes of tunes to play or for the likes of wedding party DJs it can be 100,000+ tracks that they’ll need quick access to when they’re reading the crowd’s energy and deciding what to play

Whatever method their library comes in, a DJ must know their library well. Its just another talent a DJ needs in order to be a great DJ. It doesn’t matter if you have 100 songs or 100,000. Great DJs know just what tracks they’ve got and how to curate the perfect playlist.


Like DJ hardware there’s plenty of DJ software to choose from that offer different ways to be creative. Some are locked to certain DJ hardware manufactures while others are more “open source” and work with all kinds of DJ gear. DJs in 2021 need to know how to use this software and all of its technical features.

This is a typical 4 deck setup with the popular DJ software Serato.

What DJs do - DJ Software

As you can see there can be a lot going on at once!

Here’s another popular DJ software app called Traktor that works mostly for the Native Instruments DJ hardware available like the Traktor S4 Mk3 and the Traktor Z1.

DJ software.- Traktor

So a great DJ needs to master all the buttons, graphical displays, options, features and libraries available with whatever DJ software they decide to use. Much of what you see in the software is replicated in the DJ hardware, like the fader controls for volume, frequency volume controls and effects too.

coloured waveforms

The pretty rainbow coloured sections are the audio displayed in whats called “waveform” where you can seethe volume levels increase and decrease with each kick drum, high hat, vocal and melody. The various colours usually signify what frequency the sounds are in. So red or pink is low frequency sounds like kick drums, while high frequencies are generally blue or a lighter colour for things like high hats and percussion, with oranges and greens for vocals and melodies.

Some DJ software can handle loops and samples which can be triggered as one-off playback or looped indefinitely. This has become a big part of modern day DJ-ing. You no longer need to just overlap the end of each track with the beginning of the next, now you can keep a track playing forever in a loop while you mix in multiple decks to create whole new tracks.

What DJ apps are there to choose from?

Here’s the most popular apps professional DJs use.

While there are other apps DJs use these guys definitely cover most of the market share and their integration with DJ hardware is whats most important here.


So now we’ve covered what hardware and software DJs use lets talk about the different types of DJs there are. Since they all have a different take on the act of DJ-ing and whats required.

Club and festival DJs

Types of DJ, club and festivalA club DJ is someone who works in the nightclub scene and is likely to play curated sets of a specific length. Depending on the nightclub this may be exclusively dance music, either house, techno, drum and bass or a variant of one of these.

Their demands and requirements are different to other DJs as they usually can play what they become well known for rather than pandering to a crowd. The crowd is there to hear what they play rather than demanding certain tracks. So this offers the chance to be creative and really master some awesome mixing transitions and live music production too.

Scratch DJ

Scratch DJsWhile these DJs play in clubs and festivals too they often create very different types of sets, showing off their amazing technical abilities by scratch mixing tracks together. Quite often they still use vinyl turntables but with records that feature a high pitched tone that DJ software can interpret as data, telling the app which direction the record is being played and at what speed. Effectively mimicking the old analog scratch mixing of records.

The biggest difference is the DJ hardware needed, coupled with the more frantic nature of scratch mixing that suits specialist nightclubs and festivals.

Private event DJs (Weddings, birthdays, etc)

Disco mobile DJsYou’ve no doubt had some experience of a mobile DJ at someone’s party, wedding or private event. Bringing their own lighting rigs and sound systems and often taking requests too. These guys need to be versatile with a big music library to pick from. Reading the crowd is super important as they need to entertain a potentially diverse crowd of people.

Seamless mixing is less important and the audience want to party and chat with each other rather than be wowed by the DJs amazing skills.

Never-the-less its not easy being this type of DJ either. A working knowledge of all of their hardware and software is a must, backups are a must, being able to quick change to different musical genres and know what music will get a party going is an art-form not to be mocked.

Many a club DJ would flounder in these intense environments where someone’s wedding party has to be perfect as it’ll hopefully be the only wedding party they ever have!

DJ / Producers

Music Producer DJsThese guys are musicians and DJs with so much more at their disposal. Their DJ sets often include loops and samples they created themselves or with their production team or band. It makes their DJ sets very appealing and unique because they’re generally not DJing with other people’s music.

Instead they’re creating whole new exclusive versions of their tracks (and sometimes their friend’s tracks) on-the-fly.

Imagine having a music library filled with short loops and samples of your own work. You can pick and choose which samples you want to overlay together to create entirely new sounds as you DJ. Quite a powerful thing to do right?!

This is why Producer DJs often do world tours and play to sell out crowds at big dance festivals. They’ve created an entirely exclusive and unique DJ selling point. Something that’s hard to match. They still need all the skills to work their DJ equipment and software.

They still need to know how to hype the crowd and keep the party flowing. Its no easier than any other type of DJ-ing, in-fact the intensity of having to remix your own tracks with up to 4 decks can be quite a daunting achievement!

Radio DJs

Types of DJ - RadioIf you’ve ever wondered how radio DJs differ from those in clubs and bars, its usually down to the techniques they use to mix music. Its all about the presentation and vocal personality on the radio.

A friendly voice to introduce the music and engage with the audience, so beat matching and advanced DJ techniques are less important here.

There are plenty of similarities though, one of them being curating playlists! Its so important to play the music people enjoy and will engage with, as radio DJs are usually there to help grow an audience to help raise advertising prices for the radio station. So knowing the music well, and knowing how to create the perfect set lists for the hours they are performing on the radio is key to being a good radio DJ.

They also need to know their DJ equipment inside out and its usually quite different to what club DJs will be using. Radio DJ mixers often include more deck options for different formats, or are computer driven with multiple channels, sample playback for jingles and adverts, the ability to mix in audio channels from neighbouring studios for news and weather reports.

So radio DJs are very busy while each track is playing, cue-ing up the next track, knowing what to talk about next and keeping the show on a perfectly timed schedule to fit in all the other elements a radio station must provide its audience.


So now we know what DJs do and what they use, lets look at why you may be wondering what a DJ does and how you can spot a bad DJ.

Bad beat matching

DJs cant beat matchThis used to be the most obvious way to spot a bad DJ, especially in night clubs. Because every DJ had to be able to beat match manually. No sync buttons to do it for you back then!

So the measure of a good DJ was partially down to how well they could keep two tracks perfectly beat matched. The sound of two tracks in sync is a beautiful thing to hear. So the sound of beats not in sync can be a horrible jarring experience.

Even with automatic sync controls these days they are far from perfect. Its still possible for DJ software to mis-interpret a track’s BPM and ruin a mix by badly synchronising the tempos. So beat matching is still important.

You’ll soon know what badly beat matched songs will sound like. The double thudding of kick drums, the mess of synth sounds out of whack, the percussion patterns clashing with one another. Its not a pretty sound. A great DJ will know how to beat match, a bad DJ will stick out a mile when the tempos start wandering away from each other!

Badly chosen songs for the gig

Bad DJsSo you think you can DJ? Well a bad DJ will definitely stand out when they pick the wrong song for the wrong moment at the party.

A bad wedding DJ can often do this, thinking it’ll be great to just drop in some heavy metal when everyone was enjoying some pop track. Or killing the mood with a slow track when everyone was busy dancing and partying. Reading the crowd and their energy is vitally important as a DJ.

Not only that but leaving a badly chosen track playing when the dance floor clears is the sign of a bad DJ. We’ve all been there, especially in the early days of our DJ careers.

Thinking the crowd will respond well to a track but for some reason it just kills the mood. A good DJ will realise whats happened, find another track and waste no time in ditching the offending song and switching to the (hopefully) more popular track. Even if the offending song was only 30 seconds in, its better to get the energy back in the room as quickly as possible.

Being unprofessional

DJ mistakesThis one is all too common unfortunately. DJs getting drunk, being late, letting their ego runaway with them or simply just letting their client own by being unprofessional. I’ve seen it all and no doubt you might have at some point.

DJ-ing is a job so a good DJ will always show up on time, sober and ready to work. They’re entertainers and masters of the party so making sure everyone is entertained and the client got exactly what they paid for is important.

There’s so many other mistakes DJs make so we wrote a really in-depth article, see how many you may have spotted DJs doing.

Even world famous DJs can let their fans down sometimes. Inflated egos and ridiculously sized entourages can cause all sorts of problems. The best DJs keep it professional.

So what is it that separates the best DJs in the world from the fake DJs?

What is a fake DJ anyway?

Well by fake DJ I mean people who want to be a DJ, for the ego rub, or the reputation as a party starter. They have no idea how to actually DJ, but they like how a DJ looks when they’re the centre of attention.

This mostly happens at private parties and has been perpetuated by the popularity of DJ apps available for smart phones and iPads. Back in the day we used to joke “Everyone wants to be a DJ” but they didn’t have the expensive equipment or the vast shelf-bending vinyl collection. Now all they need to ruin a party is an app on their chosen mobile device and a digital music library.

From there its just a short step to buying DJ gear and thinking they are God’s gift to music.

You’ll be all too familiar with the fake DJs of this world. There’s often one at a house party, sometimes weddings. People who lack the skills and over-compensate with confidence.

A bad mix or shoddy DJ set cannot be saved with confidence.


Gok Wan DJingOn the subject of wannabe DJs there’s been a growing trend in recent years for celebrities to garner huge sums of money for DJ appearances at famous night clubs and festivals. The likes of Paris Hilton, Gok Wan and Elijah Wood have all infiltrated the dance music scene.

Now I’m not knocking all celebrity DJs as some have actually taken the time to learn the skills and refine their craft. But on the whole celebrity DJs are just there to draw a crowd and promote a club brand on social media. They’re not there because they can 4-deck mix seamlessly with the best in the business.

So for this you might be wondering what do celebrity DJs actually do?

Over the years they’ve actually be caught doing all sorts of things like playing back to back sessions with actual DJs who do all of the work while they pretend to push buttons. Or play a pre-recorded mix (sometimes complete with embarrassing jingles and hooks for other people’s shows) while they fiddle with controls that aren’t even plugged in.

Watch this cringe-worthy video of celebrity DJs at their worst.

As I mentioned some celebrities take it seriously. Idris Elba is one such movie star who knows exactly how to DJ and in this modern world of hitting sync, its nice to see he can actually manually beat-match like a pro.

Watch this fun set by Idris Elba in conjunction with the awesome record label Defected to see just how good some celebrity DJs can be.

So we’ve walked our way through all manner of subjects on what DJs do and we’re building up a picture of what makes a great DJ. So lets summarise what a great DJ should do.

 

Do you want to be a DJ?

Maybe you searched for this topic because you want to be a DJ. Have I put you off? Or have I shown you just how awesome being a truly great DJ can be?

I’m hoping you can see its a very technical business with plenty of skills to master, but its ultimately very rewarding and if you have a love for music its the best place to be at a party.

We have lots more great articles and tutorials worth reading if you want to get started!


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