A Capo is a Clamp that fits across the
fingerboard of an acoustic or electric guitar. It reduces the length of the
string you play and so raises the pitch of the note. Playing with a capo on,
will put a tune in a higher key without you having to alter the chords. This is
especially useful if you play folk music as you can keep the folky sound of the
open-string chords instead of playing bar chords.
Guitar Capos for Electric Guitars, Acoustic
Guitar Capos, Classical Guitar Capos