Misused six-four chord · Rules
The six-four chord is only used in three ways: cadential (I⁶₄ on a strong beat going to V over the same bass), auxiliary (the bass stays and the chords before and after are the same) or passing (the bass arrives and continues by step in the same direction).
- Misused six-four chord: The six-four chord is only used in three ways: cadential (I⁶₄ on a strong beat going to V over the same bass), auxiliary (the bass stays and the chords before and after are the same) or passing (the bass arrives and continues by step in the same direction). (Piston, ch. 10, pp. 151–158)