Space plays and stops
- Notes and intervals
- G#M3B#m3D#m3F#m3A
- Extends
- G# Dominant 7
G# Dominant b9, written G#7b9, is built from G#, B#, D#, F# and A: the root, major 3rd, 5th, minor 7th and flat 9th.
Its 3rd and 7th, B# and F#, 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 G#7b9 as its tritone substitute.