A good next track matches the current one in tempo, fits it in key and continues the energy in the direction you want. Keep the tempo within a few percent, choose a key that is the same or next to it on the Camelot wheel, and start the transition at the beginning of a phrase.
In Short
The short version:
- Tempo: stay within about 5 percent, or change tempo on purpose in a break.
- Key: the same code, one number up or down, or the other letter.
- Energy: build in waves; do not stay at the peak.
- Phrasing: mix at the boundaries of 8, 16 or 32 bars.
- Trust your ears more than any rule.
Four Things Every Next Track Has to Fit
1. Tempo
Two tracks can only be blended beat on beat when they run at the same tempo. DJ equipment and software can change the speed of a track without changing its pitch, but the further you push it, the less natural it sounds, so most DJs keep the difference small: about 5 percent, which is 6 BPM at 120. Sorting your music by BPM is therefore the first step. Larger jumps are possible, but they need a break in the music: the end of a track, a section without drums or a deliberate stop.
2. Key
When two tracks play at the same time, their notes sound together. If the keys are related, bass lines, chords and vocals fit; if they are not, the overlap sounds out of tune. Choosing tracks by key is called harmonic mixing, and it relies on the circle of fifths , which arranges the 24 keys so that closely related ones are neighbors. The Camelot wheel shows the same circle with codes in place of key names: a number from 1 to 12, and A for minor or B for major.
| Move | From 8A (A minor) to | Effect |
|---|---|---|
| Same code | 8A | Seamless; the two tracks share every note |
| One number up | 9A (E minor) | Smooth, with a slight lift |
| One number down | 7A (D minor) | Smooth, slightly more relaxed |
| Same number, other letter | 8B (C major) | Same notes, brighter mood |
You can look up any key on the interactive Camelot Wheel. These four moves are the safe ones for long blends. They are not the only ones: a quick cut, or a transition while only drums are playing, works between any two keys.
3. Energy
Tempo and key say nothing about how intense a track feels. A sparse, quiet track and a dense, driving one can share both. Many DJs therefore rate the energy of their tracks, for example from 1 to 10, and plan a set as a series of waves: build up over three or four tracks, release, and build again a little higher. Staying at the peak for too long tires a dance floor as surely as never getting there.
4. Phrasing
Dance and pop music is built in blocks of 4, 8, 16 and 32 bars, and something changes at the block boundaries: a drum fill, a new instrument, the vocal. A transition sounds natural when the new track starts at such a boundary, so that its changes line up with those of the track that is playing. Count the bars, or watch the waveform: breakdowns and drops are easy to see.
A Worked Example: Five Tracks
| # | Tempo | Key | Energy | Why it follows |
|---|---|---|---|---|
| 1 | 120 | 8A | 4 | Opening track |
| 2 | 122 | 8A | 5 | Same key, a little faster and fuller |
| 3 | 124 | 9A | 7 | One number up lifts the mood |
| 4 | 124 | 9B | 8 | Same number, other letter: brighter at the peak |
| 5 | 122 | 8B | 5 | One number down and slower: the release |
No step changes the tempo by more than 2 BPM or moves further than one position on the wheel, and the energy rises to a peak before it falls.
How to Prepare Your Tracks
- Measure tempo and key. Analyze each track with the BPM & Key Analyzer and note the BPM and the Camelot code, for example in the file name. How to Find the Key and BPM of a Song explains how to check the results.
- Adjust what does not quite fit. The Pitch & Speed Changer changes the tempo of a track by a few percent or shifts its key by a semitone or two.
- Record a mix without decks. The Audio Joiner & Mixer joins tracks into one file with DJ-style transitions such as bass swaps and filter sweeps. It does not align tempos or beats for you, so choose tracks whose tempos already match, or adjust them first.
- Even out the loudness. Tracks from different sources differ in level. Measure them with the LUFS & Peak Analyzer before you publish a mix.
If you publish a mix, you need the rights to the music in it. Platforms differ in what they allow, and using commercial tracks without a license can get a mix muted or removed.
Find Compatible Keys
Click a key on the Camelot wheel to see which keys mix well with it.
Open the Camelot WheelFree, no sign-up, and your files never leave your device.