In most western music, each measure contains a fixed number of beats, and the beat gets the strongest accent.

In music, the foremost beat of the bar (downbeat) is usually the strongest accent in the melody and the probable place for a chord variation, the third is the next strongest: these are "on" beats. The second and fourth are weaker which is called the "off-beats". Subdivisions for instance eighth notes that fall in the middle of the pulse beats are even weaker and these, if used regularly in a rhythm, can also make it "off-beat

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