The B-flat major thirteenth chord (abbreviated "Bbmaj13 chord") is a seven-note chord consisting of the notes B, D, F, A, C, E, and G. The chord is formed by adding a thirteenth to a B-flat major eleventh chord.

In practice, the fifth (F) and eleventh (E) are often omitted from the Bbmaj13 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.

Name
B-flat major thirteenth chord
Notes
B D F A C E G
Intervals
1 3 5 7 9 11 13
Chord symbol
Bmaj13
Alternative symbols
B13 Bma13 BMA13 BM13
Type
heptad (seven-note chord)

Bbmaj13 chord on piano

Bbmaj13 chord on guitar

Bbmaj13 chord on ukulele

Bbmaj13 chord on the staff