Bb major 11th chord
Bbmaj11 chord for piano with keyboard diagram.
Explanation: The B flat major eleventh is a six-note chord. For practical reasons the chord is normally played with omitted notes and/or inverted. It is often abbreviated as Bbmaj11 or Bbmaj9(#11). In the latter case, the chord is played with a raised eleventh to avoid dissonance with the 3rd.
Omissions: Bbmaj11(no5): Bb - D - A - C - Eb.
Theory: The Bb major eleventh chord is constructed by extending the major ninth chord with a major eleventh note.
Bbmaj13
Notes: Bb - D - F - A - C - Eb
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