Why do musicians often count to four before starting to play? What’s significant about the number four?

Question

Why do musicians often count to four before starting to play? What’s significant about the number four?

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Answer 1

When you play Rock, Paper, Scissors, you’ll notice you follow the tempo at which it’s being said that way everybody playing picks their hand at the same time or else it’ll be a mess.

It’s the same thing with music. You count before playing so everyone can be on the same page. Can’t have anyone playing their hand too early or too late.