Space plays and stops
- Notes and intervals
- BM3D#M3F##2A
- Extends
- B Dominant 7
B Augmented 7, written B7#5, is built from B, D#, F## and A: the root, major 3rd, sharp 5th and minor 7th.
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#5 as its tritone substitute.