A capo is used in playing the guitar to change the key of a song without changing the chord shapes. In the key of A, a capo placed on the 2nd fret would allow the guitarist to play as if in the key of G, making it easier to play certain chords and melodies.
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The ideal capo key for playing in the key of A is the second fret.
If you place a capo on the 2nd fret, you are playing in the key of D major.
If you place a capo on the 4th fret, you are playing in the key of E major.
To play in the key of C with a capo, place the capo on the 3rd fret.
To play in the key of D with a capo, place the capo on the 2nd fret.