Bb major ninth chord
Bbmaj9 chord for piano with keyboard diagram.
Explanation: The Bb major ninth is a five note chord and can be regarded as a Bbmaj7 with an added ninth. It is often abbreviated as Bbmaj9 (should not be confused with Bb9).
Theory: The Bbmaj9 chord is constructed with a root, a major third, a perfect fifth, a major seventh and a major ninth.
Notes: Bb - D - F - A - C