ChordB♭7(add13)8-string bass · Standard B♭ dominant seventh added thirteenth · Frets 5–7 F♯BEADGCF5R3♭7313noteB♭DA♭DGroleR3♭7313fret65677frets 5–7C0C1C2C3C4C5RootB♭1stD2ndF3rdA♭ StrumArpeggio