Space plays and stops
- Notes and intervals
- A#M3C##m3E#M3G##
A# Major 7, written A#maj7, is built from A#, C##, E# and G##: the root, major 3rd, 5th and major 7th.
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.
In the progressions here, A#maj7 is the IIImaj7 of the Coltrane Changes in F#.