Space plays and stops
- Notes and intervals
- AbM3C2EbbM3Gb
- Extends
- Ab Dominant 7
Ab Dominant b5, written Ab7b5, is built from Ab, C, Ebb and Gb: the root, major 3rd, flat 5th and minor 7th.
Its 3rd and 7th, C and Gb, 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. D7, a tritone away, has the same two notes the other way up, so it can stand in for Ab7b5 as its tritone substitute.