Bb 11th chords Bb11 chord on a piano Formula: 1-3-5-♭7-9-11 Notes: B♭-D-F-A♭-C-E♭ chord suffix: B♭11 Use these charts to create your own B♭11 chord or play a B♭11 melody. Bb11 chord on a pianoBb 11th chord on a guitar