File:Barlines.svg · Wikimedia Commons · See Wikimedia Commons
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Encyclopedic overview
Types of bar lines In musical notation, a bar (or measure) is a segment of music bounded by vertical lines, known as bar lines (or barlines), usually indicating one or more recurring beats. The length of the bar, measured by the number of note values it contains, is normally indicated by the time signature.
Types of bar lines
Excerpted from Wikipedia’s “measure” article, available under the CC BY-SA 4.0 licence.