Fdim7 8-string bass chord

How to play Fdim7 on 8-string bass

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

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

What notes are in Fdim7?

Fdim7, F diminished seventh, is F, A♭, C♭ and E♭♭: the root (F), the minor third (A♭), the diminished fifth (C♭) and the diminished seventh (E♭♭). Its formula is 1 ♭3 ♭5 ♭♭7.

Why do four diminished seventh chords have the same notes?

A diminished seventh is minor thirds stacked all the way round, F, A♭, C♭ and E♭♭, so Fdim7 has the same notes as the diminished sevenths on A♭, C♭ and E♭♭. Any of its notes can be the root.