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In page Disco:

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Songs often use syncopation, which is the accenting of unexpected beats. In general, the difference between disco, or any dance song, and a rock or pop song is that in dance music the bass drum hits four to the floor, at least once a beat (which in 4/4 time is 4 beats per measure).[citation needed] Disco is further characterized by a 16th note division of the quarter notes (as shown in the second drum pattern in the picture above, after a typical rock drum pattern).