Other upper numbers correspond to irregular meters. The lower number is most commonly an 8 (an eighth-note or quaver): as in 9 In compound meter, the note values specified by the bottom number are grouped into threes, and the upper number is a multiple of 3, such as 6, 9, or 12. Simple meters are those whose upper number is 2, 3, or 4, sometimes described as duple meter, triple meter, and quadruple meter respectively. These symbols derive from mensural time signatures, described below.įrequently used time signatures Simple versus compound The symbol is typically used in place of 2Ģ and is called alla breve or, colloquially, cut time or cut common time.For the time period, see Common Era.īy convention, two special symbols are sometimes used for 4Ĥ time, also called common time or imperfect time. For the Field Music album, see Commontime (album). Less-common signatures correspond to complex, mixed, additive, and irrational meters. Most time signatures are either simple (the note values are grouped in pairs, like 2Ĥ) or compound (grouped in threes, like 6Ĩ). A mid-score time signature, usually immediately following a barline, indicates a change of meter. In a music score the time signature appears at the beginning as a time symbol or stacked numerals, such as or 4Ĥ (read common time or four-four time, respectively), immediately following the key signature (or immediately following the clef symbol if the key signature is empty). The time signature is a notational device representing the meter, an auditory feature of the music. The time signature (also known as meter, metre, and measure signature) is a convention in Western music notation to specify how many of a particular note value are contained in each measure ( bar). The time signature indicates that there are three quarter notes (crotchets) per measure (bar).
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