|What chords do I get when I put a capo on?|
There are twelve different notes that repeats in each octave. The name of the notes are in ascending order (I've written two ocataves):
C C# D D# E F F# G G# A
A# B C C# D D# E F F# G
G# A A# B C ...
The same notes can also be written like this:
The distance between each note is one fret. When you put a capo on the third fret, a chord, or a key, will be raised three frets. So the D position with the capo on the third fret will give you an F chord (count from D in ascending order). And an A7 position will give you a C7 chord. It's as easy as that. All you have to do is to learn the names of the twelve notes and count the frets.