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        Formula for Piano Chords and General Theory


        Half Steps        Formula                         abbrev

        1-5-8-13        Major chords    -----------------

        1-4-8-13        Minor chords    ----------------- m

        1-5-8-11        For 7th chords  ----------------- 7th

        1-5-8-12        For Major 7th   ----------------- maj7

        1-4-8-11        For minor 7th   ----------------- m7 or min7th

        1-6-8-13        Suspended 4th   ----------------- sus4

        1-4-7-10        Diminished      ----------------- dim

        1-5-9-13        augmented chord ----------------- aug

        1-4-8-10        Minor 6th       ----------------- m6 or min6th