Space plays and stops
- Notes and intervals
- BM3D#m3F#m3A4D
- Extends
- B Dominant 7
B Dominant #9, written B7#9, is built from B, D#, F#, A and D: the root, major 3rd, 5th, minor 7th and sharp 9th.
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. F7, a tritone away, has the same two notes the other way up, so it can stand in for B7#9 as its tritone substitute.