Playing an A chord by using a capo and a G chord.
The main purpose of a capo is to allow the guitar player to play in many keys while using his favorite chords. For example, if a violin player is playing a song in the key of A, but the guitarist finds it easier to pick and play in the key of G, she could clamp the capo on the second fret and play in the key of G as usual. With the capo on the second fret, the G chord becomes an A chord and they are both in tune with each other. Many beginner guitar books include songs that are written in keys that make easy playing, but not easy singing, which might discourage the new student. A soprano might be able to sing it, but not the man who sings base. By positioning the capo up the neck of the guitar where singing is comfortable, the musician can use the chords that are written and find that singing comes with less strain.
A spring capo, left, and an adjustable lever, right.
There are many types of capos. Some have elastic that wraps around the back of the guitar. Others have an adjustable screw that determines how much pressure is applied to the pad of the capo. A favorite type for musicians is the spring capo. This capo can be put on and taken off quickly without squeaks or popping. When not needed, the spring capo can be clamped on the headstock (the area where the tuning keys are mounted).
Place a capo on a fret.Place the capo as close to the fret as possible. If your capo has an adjustable nut, turn it just far enough to solidly clamp it on without any strings buzzing as you strum. Place the capo parallel to the frets.
