ChordB♭7♭138-string bass · Standard B♭ dominant seventh flat thirteen · Frets 1–2 F♯BEADGCFR♭73♭13noteB♭A♭DG♭roleR♭73♭13fret1121frets 1–2C0C1C2C3C4C5RootB♭1stD2ndF3rdA♭ StrumArpeggio