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,