Plural of backbeat; multiple instances of the rhythmic accents on the second and fourth beats in musical measures.
From 'backbeat' + the regular plural suffix '-s'. This is simply the plural form of backbeat, used when discussing multiple measures or musical pieces featuring this rhythm technique.
When drummers talk about 'locking into the backbeats,' they're describing the sweet spot where the rhythm section creates the pocket that makes people dance—it's the difference between a song that moves you and one that doesn't.
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