Space plays and stops
- Notes and intervals
- G#M3B#M3D##2F#
- Extends
- G# Dominant 7
G# Augmented 7, written G#7#5, is built from G#, B#, D## and F#: the root, major 3rd, sharp 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#7#5 as its tritone substitute.