Ninth chords (9 chords), construction, intervals and types.
- Major ninth chord. Symbol: maj9. Intervals: 1, 3, 5, 7, 9.
- Ninth chords. Symbol: 9. Intervals: 1, 3, 5, b7, 9.
- Minor ninth chord. Symbol: m9. Intervals: 1, b3, 5, b7, 9.
- Major add ninth. Symbol: add9. Intervals: 1, 3, 5, 9.
- Minor add ninth. Symbol: m add9. Intervals: 1, b3, 5, 9.