A type of synthesized clap is popular in many rap and hip hop songs as well. This is derived from and mimics the technique used in older popular music, eg disco and funk of the 1970s, in which multiple instances of real handclaps were recorded (or a single recording was made of a group of performers clapping in unison), usually for the purpose of reinforcing the snare drum beat on the 2nd and 4th beats of the bar. Modern r&b, hip hop and rap often omits the snare drum, making the claps a more obvious and central feature of the beat.
Source: Wikipedia > Clapping
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