B minor ninth chord
Bm9 chord for piano with keyboard diagram.
Explanation: The B minor ninth is a five note chord. For practical reasons the chord is normally played with omitted notes and/or inverted. The chord is often abbreviated as Bm9.
Theory: The Bm9 chord is constructed with a root, a minor third, a perfect fifth, a minor seventh and a major ninth.
Notes: B - D - F# - A - C#