eli5: How do harmonicas work? Like how does it get that crunchy sound?

Question

eli5: How do harmonicas work? Like how does it get that crunchy sound?

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Answer 1

You’ve basically got a whole rack of whistles strapped together, each with a slightly different pitch than it’s neighbors. Because they’re so tightly packed you’ll never blow on just one of the whistles, you’ll also get all the whistles next to it.