The B-flat dominant eleventh chord (abbreviated "Bb11 chord") is a six-note chord consisting of the notes B, D, F, A, C, and E. The chord is formed by adding an eleventh to a B-flat dominant ninth chord.

In practice, the third (D) and fifth (F) are often omitted from the Bb11 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.

Name
B-flat dominant eleventh chord
Notes
B D F A C E
Intervals
1 3 5 7 9 11
Chord symbol
B11
Type
hexad (six-note chord)

Bb11 chord on piano

Bb11 chord on guitar

Bb11 chord on ukulele

Bb11 chord on the staff