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bar

A group of beats, most often four, marked by the heavier grid lines.

A group of beats, most often four, bounded by the heavier lines on the piano-roll grid. Bars are how music is counted and arranged: a phrase is often four or eight of them. Also called a measure.

Learn it: The piano roll

The one-sentence definition at the top is the same one the Theory Aide extension shows as a tooltip inside Ableton Live. Hover any dotted term for its own.