Space plays and stops
- Notes and intervals
- A#m3C#M3E#m3G#
A# Minor 7, written A#m7, is built from A#, C#, E# and G#: the root, minor 3rd, 5th and minor 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#m7 is the iii7 of the Major iii-VI-ii-V Progression in F# and the vii7 of the Bebop Rhythm Changes in B.