A♯dim 8-string bass chord

How to play A♯dim on 8-string bass

The most common way, the first shape above: your index finger on the F♯ string at the 4th fret and your middle finger on the A string at the 4th fret. Let the E string ring open. Don’t play the B, D, G, C and F strings.

From the F♯ string 4 x 0 4 x x x x (x: not played, 0: open)

What notes are in A♯dim?

A♯dim, A♯ diminished, is A♯, C♯ and E: the root (A♯), the minor third (C♯) and the diminished fifth (E). Its formula is 1 ♭3 ♭5.

What is the difference between A♯dim, A♯m7♭5 and A♯dim7?

A♯dim is three notes, A♯, C♯ and E. A♯m7♭5 adds the minor seventh, G♯; A♯dim7 adds the diminished seventh, G, a half step lower.

Where does A♯dim go?

Most often up a half step, to B: it is the chord on the seventh note of a major key, leading back to the tonic.

Keys with A♯dim

A♯dim is the vii° chord in B major and the ii° chord in G♯ minor.