http://www.playpiano.com Major chords are composed of the root, 3rd, and 5th of a major scale. And since there are 12 major scales (more if you count all enharmonic possibilities) then there are 12 major chords. Come on over to http://www.playpiano.com and sign up for our free newsletter by email on piano chords and chord progressions if you like this kind of thing and want to learn more.
