Root : B
Minor 3rd : D
5th : F#
Dominant 7th : A
9th : C#
Bm9
Contains a D as the bass note.
Notated as B/D
Bm9/D
Contains an A as the bass note.
Notated as B/A
Bm9/A
Contains a C# as the bass note.
Notated as B/C#
Bm9/C#
The minor ninth chord consist of a minor seventh chord and a major ninth. The formula is 1, ♭3, 5, ♭7, 9. This chord has a more "bluesy" sound and fits very well with the dominant ninth.