An alternative answer to the others, most of which assume the musicians are playing different parts – when playing the same part, it adds a more layered/textured effect, like a “chorus” pedal for a guitar. When recording guitar, for example, you’d often record multiple tracks of the same part for a fuller sound. Even copying/pasting the same recording but moving one ever so slightly out of sync has the same effect. It makes a huge difference, and without these layers it’d sound quite thin and underwhelming.
You could even compare it to a crowd chanting the same song at a soccer game vs one lonesome chap.
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