Question

What is a capo used for on an acoustic guitar?

Answer 1

A capo is a device that clamps down across the guitar's fingerboard at a particular fret. Capos shorten the length of all the strings at the same time, creating, in effect, a new nut. All the “open” strings now play in higher pitches than they do without the capo.

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Answer 2

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Capo used for on an acoustic guitar because it is made for it.