Space plays and stops
- Notes and intervals
- E#M3G##m3B#m3D#4Ab
- Extends
- E# Dominant 7
E# Dominant #9, written E#7#9, is built from E#, G##, B#, D# and Ab: the root, major 3rd, 5th, minor 7th and sharp 9th.
Its 3rd and 7th, G## and D#, 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. B7, a tritone away, has the same two notes the other way up, so it can stand in for E#7#9 as its tritone substitute.