Adim 8-string bass chord

How to play Adim on 8-string bass

The most common way, the first shape above: your index finger on the D string at the 1st fret and your ring finger on the G string at the 2nd fret. Let the A and C strings ring open. Don’t play the F♯, B, E and F strings.

From the F♯ string x x x 0 1 2 0 x (x: not played, 0: open)

What notes are in Adim?

Adim, 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 Adim, Am7♭5 and Adim7?

Adim is three notes, A, C and E♭. Am7♭5 adds the minor seventh, G; Adim7 adds the diminished seventh, G♭, a half step lower.

Where does Adim 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 Adim

Adim is the vii° chord in B♭ major and the ii° chord in G minor.