A#/B♭ Major 13th chords Author: Juan Martinez Categories: A♯ Chords Tags: Maj13 Chords Bb major 13 chord on a piano Formula: 1-3-5-7-9-13 Notes: B♭-D-F-A-C-G chord suffix: B♭Maj13 Use these charts to create your own B♭Maj13 chord or play a B♭Maj13 melody Bb major 13 chord on a pianoBb Major 13th chord on a guitar