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
