Kilka pomocnych stron z akordami :
http://www.chords.pl/kurs/chwyty/
http://keychord.com/
http://www.8notes.com/piano_chord_chart/
http://notationmachine.com/chords/piano/
http://tabnabber.com/piano_chords.asp?chordName=+Major&r=0&o=4,7,