Bb Major 7th sharp 11th chords Bb Major 7#11 on a piano Formula: 1-3-5-7-#11 Notes: B♭-D-F-A-E chord suffix: B♭Maj7#11 Use these charts to create your own B♭Maj7#11 chord or play a B♭Maj7#11 melody. Bb Major 7#11 on a pianoBb Major 7th sharp 11th chord on a guitar