<Li> The lower numeral indicates the note value that represents one beat (the beat unit). </Li> <Li> The upper numeral indicates how many such beats constitute a bar . </Li> <P> For instance, means two quarter - note (crotchet) beats per bar, while means three eighth - note (quaver) beats per bar . The most common simple time signatures are,, and . </P> <P> By convention, two special symbols are sometimes used for and: </P>

The time signature 2/4 indicates how many beats in a measure
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