C7(add13) 8-string bass chord

How to play C7(add13) on 8-string bass

The most common way, the first shape above: your middle finger on the F♯ string at the 6th fret, your index finger on the B string at the 5th fret, your ring finger on the E string at the 6th fret, your little finger on the A string at the 7th fret and your little finger on the D string at the 7th fret. Don’t play the G, C and F strings.

From the F♯ string 6 5 6 7 7 x x x (x: not played, 0: open)

What notes are in C7(add13)?

C7(add13), C dominant seventh added thirteenth, is C, E, G, B♭ and A: the root (C), the major third (E), the perfect fifth (G), the minor seventh (B♭) and the thirteenth (A). Its formula is 1 3 5 ♭7 13.