ChordB♭7♯9♭138-string bass · Standard B♭ dominant seventh sharp nine flat thirteen · Frets 3–4 F♯BEADGCF3R3♭7♯9♭13noteB♭DA♭C♯G♭roleR3♭7♯9♭13fret43444frets 3–4C0C1C2C3C4C5RootB♭1stD2ndF3rdA♭ StrumArpeggio