Space plays and stops
- Notes and intervals
- G#M3B#2DM3F#
- Extends
- G# Dominant 7
G# Dominant b5, written G#7b5, is built from G#, B#, D and F#: the root, major 3rd, flat 5th and minor 7th.
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#7b5 as its tritone substitute.