Boom Bap is a foundational subgenre and production style of East Coast hip-hop that defined the 1990s “Golden Age”. The name itself is an onomatopoeia describing the hard-hitting, distinct sound of its drum pattern: the “boom” of the acoustic bass drum (kick) on the downbeat, followed immediately by the sharp, punchy “bap” of the snare drum on the upbeat (typically in a standard $4/4$ time signature at around 85–95 BPM).