Space plays and stops
- Notes and intervals
- B#M3D##m3F##m3A#M3D5A
- Extends
- B# Dominant 7
B# Dominant 13, written B#13, is built from B#, D##, F##, A#, D and A: the root, major 3rd, 5th, minor 7th, 9th and 13th.
Its 3rd and 7th, D## and A#, 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. Gb7, a tritone away, has the same two notes the other way up, so it can stand in for B#13 as its tritone substitute.