Eli5: Music theory: Why do we have certain time signatures?

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If signature does not denote tempo, why do we need signatures like 2/4 or 6/8? Why can’t the music just be written in 4/4 or 3/4?

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Anonymous 0 Comments

Sometimes when writing sheet music, it’s easier to write in a different time signature to make the flow of reading it easier. For instance, writing in 7/8th for a piece would save having to constantly jump between 4/4 and 3/4 every other bar.

Or maybe the piece has an off-beat bridge between 2 sections that’s only half a bar long.

Or for piano, sheet music has both left and right hand on 2 different lines, maybe your right hand plays twice the speed as the left hand. Either way the performer needs them to be written at the same place on the page, otherwise you go cross-eyed trying to read it in 2 different areas!

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