B♭ Major 6th :: B♭ D F G

B
F♯
D
A
3
6
B♭
3
5
B♭
6
3
5
6
3
B♭
5
6
B♭
5
⬤ ⬤
3
⬤ ⬤
B♭ Minor :: B♭ D♭ F

B
F♯
D
A
B♭
♭3
5
B♭
♭3
5
♭3
B♭
5
B♭
5
♭3
⬤ ⬤
⬤ ⬤