DJing has its own language. Some of it comes from hardware engineering. Some from the culture itself. If you are learning to mix, this glossary covers every term you will encounter — organized by category, defined without jargon.

Mixing Techniques

Beatmatching
Adjusting the tempo and phase of two tracks so their beats align perfectly. The fundamental skill of DJing. When beatmatched, the kick drums of both tracks hit at the same time, allowing them to play together without rhythmic collision.
Blending / Fade
A gradual transition where both tracks play simultaneously for an extended period, usually 16 to 64 bars. The DJ uses the crossfader and EQ to slowly shift the audience's attention from one track to the next.
Crossfade
Moving the crossfader from one deck to the other during a transition, smoothly transferring audio from the outgoing track to the incoming track. A long crossfade creates a blend. A short crossfade creates a cut. See How to Crossfade.
Cut
An abrupt transition from one track to another with no blend. The outgoing track stops (or is killed by EQ) and the incoming track takes over immediately. Effective when the energy is right, sloppy when it is not.
Drop Mix
Timing a transition so the incoming track's drop (the energetic payoff after a breakdown) hits exactly when the outgoing track ends. Requires precise cueing and knowledge of both tracks' structures.
EQ Mixing
Using the equalizer to transition between tracks by swapping frequency ranges. A common technique: cut the bass on the incoming track, blend it in, then swap the bass — cutting it on the outgoing track and bringing it in on the incoming track simultaneously.
Phrase Matching
Aligning the musical phrases (groups of 8, 16, or 32 bars) of two tracks so that structural elements — breakdowns, drops, builds — occur at musically logical points during the transition.
Transition
The passage from one track to another. Every DJ set is a series of transitions. Quality of transitions is what separates a playlist from a DJ mix.

Equipment

Deck
A playback unit. In traditional setups, a turntable or CDJ. In software, a virtual player that loads and plays one audio file. Most DJ setups use two decks (A and B), though some use four.
Mixer
The device that combines audio from multiple decks. A DJ mixer has channel faders, a crossfader, EQ knobs, and often filters and effects. In browser-based DJing, the mixer is the software interface.
Crossfader
A horizontal slider on the mixer that controls the audio balance between two decks. Full left plays only Deck A. Full right plays only Deck B. Center plays both at equal volume.
Channel Fader
A vertical slider that controls the volume of a single deck. Unlike the crossfader, which blends between channels, the channel fader controls absolute volume for one source.
EQ (Equalizer)
Knobs that control the volume of specific frequency ranges. A standard DJ EQ has three bands: low (bass), mid (vocals, leads), and high (hi-hats, cymbals). DJs use EQ to avoid frequency clashes during blends and to shape the sound.
Filter
An effect that removes frequencies above (low-pass) or below (high-pass) a threshold. Turning a low-pass filter gradually removes high frequencies, making the sound muffled and distant. High-pass does the opposite, thinning the sound by removing bass. Filters are used for smooth builds and transitions.
Headphones / CUE
DJs use headphones to preview the next track before the audience hears it. The CUE button routes a deck's audio to the headphone output without sending it to the main speakers. This allows the DJ to beatmatch and find the right starting point privately.

Tempo

BPM (Beats Per Minute)
The tempo of a track, measured in beat pulses per 60 seconds. House music typically runs 120-130 BPM. Techno 125-145. Drum & bass 170-180. Use the TuneLab BPM Finder to detect any track's tempo automatically. See What is BPM for a deep dive.
Sync
A software feature that automatically matches the BPM and phase of two tracks. Pressing sync adjusts the playback speed of one track to match the other. Purists debate it. Pragmatists use it.
Pitch
In DJ context, the pitch fader (or slider) controls playback speed. Moving it up speeds up the track (raising pitch and BPM). Moving it down slows it (lowering both). Modern software can adjust tempo without changing pitch using time-stretching.
Time-Stretching
An algorithm that changes a track's tempo without affecting its pitch. Without time-stretching, speeding up a track makes it sound higher-pitched (chipmunk effect). Time-stretching preserves the original tonality while adjusting BPM.

Track Structure

Intro
The opening bars of a track. In DJ-friendly music, the intro is typically 16 or 32 bars of simplified rhythm — just kick and hats — designed as a mix-in point for the previous track.
Outro
The closing bars of a track. Mirrors the intro in structure, providing a mix-out point. A clean outro-to-intro transition is the bread and butter of DJ mixing.
Breakdown
A section where the rhythm drops away, leaving pads, vocals, or atmospheric elements. Creates tension and anticipation. Breakdowns precede drops.
Drop
The moment after a breakdown when the full rhythm returns — usually with maximum energy. The most impactful moment of a track. DJs aim to hit drops at climactic points in the set.
Build / Build-Up
The bars leading into a drop. Rising filter sweeps, snare rolls, increasing tension. The build tells the audience something big is coming.

DJ Culture

Set
A continuous DJ performance. A set typically runs 1-3 hours and consists of tracks mixed together to create a musical journey. Opening sets are lower energy. Peak-time sets bring maximum intensity.
Mixtape / Mix
A recorded DJ set. Historically distributed on cassette tape (hence the name), now shared digitally on platforms like Mixcloud and SoundCloud. A mixtape showcases a DJ's track selection and mixing ability. See How to Make a Mixtape.
B2B (Back to Back)
Two DJs playing on the same setup, alternating tracks or taking turns at the decks. Each DJ plays one or two tracks before handing off. B2B sets are collaborative and often improvised.
Warm-Up
The opening set before the headliner. The warm-up DJ plays lower-energy tracks to build the room gradually. Good warm-up DJs read the room and set the tone without peaking too early.
Peak Time
The slot (usually midnight to 2 AM) when the dancefloor is fullest and the DJ plays the most energetic tracks. Peak-time sets are high-intensity, high-BPM, and demand the strongest track selection.
Digging / Crate Digging
The process of searching for records — originally in physical crates at record shops, now in digital libraries and streaming platforms. Track selection starts with digging. The quality of your dig determines the quality of your set.

Detect musical key with the TuneLab Key Finder and BPM for any track with TuneLab — free browser-based audio analysis tools.