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septuple meter
Septuple meter (British: metre) or (chiefly British) septuple time is a meter with each bar (American: measure) divided into 7 notes of equal duration, usually or (or in compound meter, time). The stress pattern can be 2+2+3, 3+2+2, or occasionally 2+3+2. A time signature of , however, does not necessarily mean that the bar is a compound septuple meter with seven beats, each divided into three. This signature may, for example, be used to indicate a bar of triple meter in which each beat is subdivided into seven parts. In this case, the meter is sometimes characterized as "triple septuple time".〔Read 1964, 152.〕 It is also possible for a time signature to be used for an irregular, or "additive" metrical pattern, such as groupings of 3 + 3 + 3 + 2 + 3 + 2 + 3 + 2 eighth notes. Septuple meter can also be notated by using regularly ''alternating'' bars of triple and duple or quadruple meters, for example + , or + + , or through the use of "compound meters", in which two or three numerals take the place of the expected numerator 7, for example, , or .〔Read 1964, 161 and 164–65.〕
==History==
Before the 20th century, septuple time was rare in European concert music, but is more commonly found in European folk music and in other world cultures.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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