Space plays and stops
- Notes and intervals
- B#M3D##m3F##m3A#b7G#
- Extends
- B# Dominant 7
B# Dominant b13, written B#7b13, is built from B#, D##, F##, A# and G#: the root, major 3rd, 5th, minor 7th and flat 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#7b13 as its tritone substitute.