The whole purpose of a time signature is to indicate how many beats there might be to a musical unit known as a 'bar'.

It contains many different forms. See if you can spot ... But before we get on to that, we need to learn how many beats each note is played for. Naomi: All right, so a beat. That's the steady ...

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It's also possible to change the bottom number to a different unit ... but what sort of beats? The 8 signifies a unit of quavers or 1/8th notes, but musical conformity suggests that we tend ...