This is humans driven database of youtube tracks, which are compatible in some way (same BPM or key, mood, wordplay, etc..), and its primary for DJs.
Algorithm:
For each A => B, you get A <=> C and B <=> D,
meaning if 2 songs are cool to mix, the app will output all songs that are cool to mix with these two.
- DJ transitions based on same instrumental / beat / riddim
- DJ transitions based on remix
- DJ transitions based on obvious samples ( Ice Ice Baby -> Queen - Under Pressure)
Mixes already used by other djs ARE OK! / please do mention origin
Same or similar BMP.
Same or complementary musical scale. Note that acuracy of Serato, Traktor, Mixedinkey, Rekordbox is 60-80%.
Use your ears or musical instrument. Helpfull tools are camelot wheel and Scale finder
Vibe, energy, same era..
Can range from puns to advanced storytelling, nevertheless clubber should be able to get the message without knowing tracks. Safe wordplays are "Bitch", "Fuck", "Stop" etc..
Advanced technique popular within competitive DJs. Playing melody of song B, using hotcues mapped with isolated melody from song A. Also can be achieved by pitching MIDI-mapped single cuepoint supported by some devices.