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Boom bap is a rhythmic combination inserted and assimilated in a style of production derived from hip-hop music. The term "boom bap" is onomatopoeia for the drum sounds prominent in the 90's East Coast hip hop. The style is famous for its hard bass drum and snare drum. In a typical "boom bap" beat, the snare drum comes in on beats 2 and 4 of a four-beat measure, while the bass drum appears on the first and third beat. Prominent hip-hop artists that incorporated "boom bap" in their music include Nas, Eminem, 2Pac and Common.