Open or 12th fret, Key of C

1st or 13th fret, Key of Db

2nd or 14th fret, Key of D

3rd or 15th fret, Key of Eb

4th fret, Key of E

5th fret, Key of F

6th fret, Key of Gb

7th fret, Key of G

8th fret, Key of Ab

9th fret, Key of A

10th fret, Key of Bb

11th fret, Key of B