The 808 — Roland's TR-808 drum machine, born in 1980 and almost immediately rejected for being unconvincing — has become the defining bass voice of trap, drill, modern hip-hop and large parts of pop. The 808 kick is not a kick; it is a sub-bass note with a transient at the front. It can be tuned to a pitch (often the song's root), and it sustains for hundreds of milliseconds — much longer than an acoustic kick.
Translating the 808 to an acoustic kit means accepting that you cannot reproduce it. You can, however, voice it. A floor tom — tuned low, with the resonant head loose — gives you a long-decay low note. A second kick drum, if you have one, can be detuned to do the same. A combination of acoustic kick and electronic trigger is the modern compromise. The notational convention in this lesson uses the floor tom as the 808 voice and the bass drum as the percussive layer.
Voice Mapping
- Bass drum (f/4) — the kick layer (short, percussive transient).
- Floor tom (a/4) — the 808 layer (long, low, sub).
- Hi-hat (g/5/x2) — the trap hat line, often rolling.
- Snare (c/5) — backbeat (often on 3 in a half-time trap feel — the second backbeat).
Half-Time Counting
Trap is usually written and felt at half the BPM of the underlying hat roll. A hat playing apparent 16ths at 140bpm is actually playing 32nds against a 70bpm pulse. The snare on 3 — what would be beat 3 at full tempo — is the backbeat. This lesson is notated at the half-time pulse so the snare feels like a 2-and-4 backbeat in a slow song.