Bb Minor Add9 (Bbmadd9)
Also written as A# Minor Add9 (A# and Bb are the same key).
Notes in Bb Minor Add9
Inversions
Same notes as Bb Minor Add9, 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 (Bbmadd9/C#)
2nd inversion
E# in the bass (Bbmadd9/E#)
3rd inversion
B# in the bass (Bbmadd9/B#)
Open voicings
A close-position chord like Bb Minor Add9 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
E# on the bottom
Drop 3
C# on the bottom
Bb Minor Add9 consists of A#, C#, E# and B#, played at the same time.
A minor triad with a ninth added but no seventh. It keeps the plain minor mood while sounding a little wider and more thoughtful. Pop ballads and film piano use it when a normal minor chord feels too bare but a full minor ninth would sound too jazzy.