bar line 
noun Music
A vertical line used in a musical score to mark a division between bars.Stopping before a bar line inhibits the central nervous system of the student who could otherwise tend to take over and encourage rushing over bar lines into downbeats....
- Here, the phasing occurs solely through human means, as the music gets pushed bit by bit ‘ahead’ of the bar line.
- That is absurd, because the bar line is a notational, not a musical, matter.
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