Hip hop is full of onomatopoeia, but there's perhaps none more evocative and concrete than boom bap—the boom is the kick drum and the bap is the snare, obviously. Considering how the overwhelming majority of popular music is drive by kick/snare rhythms, it's faintly ridiculous to attach the phrase to a particular stripe of breakbeat-driven rap music. But in the past decade, as DJ Premier and his disciples receded from the mainstream and post-Lil Jon producers favorite claps over snares, "boom bap" increasingly carries a very specific meaning about a very particular type of hip hop.