The A#m/E# chord is a A# minor chord, with the E# (the 5th) as the bass note.
The A# minor chord itself has a dark, melancholy sound. Playing the 5th of the chord (in the case of A#m, the 5th is E#) as the bass note, can make the chord sound even more dark and dramatic, even if it is only a subtle difference.
The chord is also referred to as A sharp minor over E sharp, or A#m ‘slash’ E#, or simply, A sharp minor with an E sharp in the bass.
Technically, the A sharp minor chord with the E sharp in the bass is a second inversion A sharp minor chord.
Some A#m/E# Chord Theory and Info
- The A#m/E# chord contains the notes E#, A# and C#.
- It is an A# minor chord with an E# in the bass.
- The root note of A#m/E# is A#, the bass note is E#.