fixed some headings

meter.md

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 title: Meter and time signatures
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 Meter involves the way multiple pulse layers work together to organize music in time. Standard meters in Western music can be classified into *simple meters* and *compound meters*, as well as *duple*, *triple*, and *quadruple* meters. 
 
 Duple, triple, and quadruple classifications result from the relationship between the counting pulse and the pulses that are *slower* than the counting pulse. In other words, it is a question of *grouping*: how many beats (secondary pulse) occur in each bar (primary pulse). If counting-pulse beats group into twos, we have duple meter; groups of three, triple meter; groups of four, quadruple meter. Conducting patterns are determined based on these classifications.