By eHow Arts & Entertainment Editor
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A capo is a guitar accessory that clamps across the strings on the fingerboard to make the overall pitch higher. It makes it easier to play in different keys. A capo raises the guitar's pitch a half step at each fret. The open strings are G, F, E, D, C, B, and A. When the capo is applied to the first fret the strings become G-sharp, F-sharp F, E-flat, C-sharp C and B-flat.