Space plays and stops
- Notes and intervals
- AM3C#m3Em3GM3B
- Extends
- A Dominant 7
A Dominant 9, written A9, is built from A, C#, E, G and B: the root, major 3rd, 5th, minor 7th and 9th.
Its 3rd and 7th, C# and G, 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. Eb7, a tritone away, has the same two notes the other way up, so it can stand in for A9 as its tritone substitute.