What is a capo, and do I need one?
A capo is a clamp-like device that, when installed, goes across strings 1, 2, 3 and 4. It forms a bar across the strings so that the strings will sound at the pitch of the new, higher fret. Using a capo allows you to play solos you have already figured out in one key in a new key without having to relearn new fingerings. Most players find they need a capo once they begin to play along with other instruments and singers who sing in different keys.