Space plays and stops
- Notes and intervals
- A#M3C##m3E#M3G##m3B#
- Extends
- A# Major 7
A# Major 9, written A#maj9, is built from A#, C##, E#, G## and B#: the root, major 3rd, 5th, major 7th and 9th.
Its 3rd and 7th, C## and G##, 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.