Space plays and stops
- Notes and intervals
- CM3Em3Gm3BbM3D
- Extends
- Dominant 7
C Dominant 9, written C9, is built from C, E, G, Bb and D: the root, major 3rd, 5th, minor 7th and 9th.
Its 3rd and 7th, E and Bb, are its guide tones: they say what kind of chord it is, so voicings are built around them and the root is often left to the bass. Gb7, a tritone away, has the same two notes the other way up, so it can stand in for C9 as its tritone substitute.