Bb Minor 6/9 (Bbm6/9)
Also written as A# Minor 6/9 (A# and Bb are the same key).
Notes in Bb Minor 6/9
Inversions
Same notes as Bb Minor 6/9, with a different chord tone as the lowest note. Useful for smoother movement between chords instead of jumping around the keyboard.
Root position
A# in the bass
1st inversion
C# in the bass
2nd inversion
E# in the bass
3rd inversion
G in the bass
4th inversion
B# in the bass
Open voicings
A close-position chord like Bb Minor 6/9 can sound cluttered in the middle of the keyboard. Jazz players open it up by dropping one note down an octave, spreading the same notes wider without changing the chord.
Drop 2
G on the bottom
Drop 3
E# on the bottom
Bb Minor 6/9 is built from A#, C#, E#, G and B#.
A minor triad carrying both a sixth and a ninth, with no seventh in sight. It has the same open, settled quality as the major 6/9 chord moved into a minor key, and it works well as a tonic minor color in jazz and bossa nova wherever a plain minor seventh would sound too ordinary.