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In Musical Notation , a bar or '''measure''' is a segment of time defined as a given number of Beats of a given duration. The word ''measure'' is heard more frequently in the U.S. , while ''bar'' is used in other English-speaking countries, although musicians generally understand both usages. The word ''bar'' derives from the vertical lines which separate one measure from another, and not the bar-like (i.e., rectangular) dimensions of a typical measure of music. A bar line (or '''barline''') is a vertical line which separates bars. A '''double bar''' can consist of two single barlines drawn close together, separating two Sections within a piece, or a barline followed by a thicker barline, indicating the end of a piece or movement. A Repeat barline looks like the second type of a double bar but has two more dots, one above the other, indicating that the section of music that is before is to be repeated. The beginning of the repeated passage can be marked by a ''begin-repeat'' barline; if this is absent the repeat is understood to be from the beginning of the piece or movement. This begin-repeat barline, if appearing at the beginning of a staff, does not act as a true barline because no bar is before it; its only function is to indicate the beginning of the passage to be repeated. Note that the term ''double bar'' refers not to a type of ''bar'' (i.e., measure), but to a type of ''barline''. Music end is a term for the barline denoting the end of a piece of music http://www.dolmetsch.com/musicalsymbols.htm − Chart of Musical Symbols In music with a regular ) have placed barlines at different places in the different parts to indicate varied groupings from part to part. A hypermeasure, large-scale or high-level measure, or measure-group is a Metric Unit in which, generally, each regular measure is one beat (actually Hyperbeat ) of a larger meter. Thus a beat is to a measure as a measure/hyperbeat is to a hypermeasure. Hypermeasures must be larger than a notated bar, perceived as a unit, consist of a pattern of strong and weak beats, and along with adjacent hypermeasures, which must be of the same length, create a sense of Hypermeter . The term was coined by Edward T. Cone . Stein 2005, p.18-19, 329 HISTORY Barlines came into general use in the 1600s, when music began to be written in Score format rather than individual parts. 16th-century usage was primarily restricted to Lute and Vihuela music, but such barlines typically were not used to indicate a regular meter. Harvard Dictionary of Music SEE ALSO SOURCES REFERENCES
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