Meter in Classical Music
In music of the common practice period (about 1600–1900), there are four different families of time signature in common use:
- Simple duple – two or four beats to a bar, each divided by two, the top number being "2" or "4" (2/4, 2/8, 2/2 … 4/4, 4/8, 4/2 …). When there are four beats to a bar, it is alternatively referred to as "quadruple" time.
- Simple triple ( 3/4) – three beats to a bar, each divided by two, the top number being "3" (3/4, 3/8, 3/2 …)
- Compound duple - two beats to a bar, each divided by three, the top number being "6" (6/8, 6/16, 6/4 …)
- Compound triple - three beats to a bar, each divided by three, the top number being "9" (9/8, 9/16, 9/4)
If the beat is divided into two the meter is simple, if divided into three it is compound. If each measure is divided into two it is duple and if into three it is triple. Some people also label quadruple, while some consider it as two duples. Any other division is considered additively, as a measure of five beats may be broken into duple+triple (12123) or triple+duple (12312) depending on accent. However, in some music, especially at faster tempos, it may be treated as one unit of five.
Read more about this topic: Meter (music)
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