PorchtoneChords in every key
Every key gives you seven chords that sound right together. Pick one to see them, hear the common progressions in that key, and find the capo shapes for guitar.
Major keys
Minor keys
How the chords in a key work
Take a major scale and build a chord on each of its seven notes using only notes from that scale. You get the same pattern in every major key: major, minor, minor, major, major, minor, diminished. Songwriters label them with roman numerals (I, ii, iii, IV, V, vi, vii°) so a progression like I–V–vi–IV works in any key.
In C major that's C, Dm, Em, F, G, Am, B°. Minor keys use the natural minor scale, which gives minor, diminished, major, minor, minor, major, major.