Fdim 7-string bass chord

How to play Fdim on 7-string bass

The most common way, the first shape above: lay your index finger flat across the four strings from the A to the C at the 8th fret, your ring finger on the D string at the 9th fret and your little finger on the G string at the 10th fret. Don’t play the B, E and F strings.

From the B string x x 8 9 10 8 x (x: not played, 0: open)

What notes are in Fdim?

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

What is the difference between Fdim, Fm7♭5 and Fdim7?

Fdim is three notes, F, A♭ and C♭. Fm7♭5 adds the minor seventh, E♭; Fdim7 adds the diminished seventh, E♭♭, a half step lower.

Where does Fdim go?

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

Keys with Fdim

Fdim is the vii° chord in F♯ major and the ii° chord in E♭ minor.