Bb13#11 chord
Bb13#11 chord for piano presented by keyboard diagrams.
Explanation: The Bb13#11 alter the Bb13 by the change of one note. The B flat thirteenth sharp eleventh is a seven-note chord, but due to practical circumstances, one or more notes (the fifth primarily) are omitted. The chord name can also be written as Bb13(#11) or Bb13+11.
Theory: Compared to Bb13 the eleventh tone in the chord is sharpenedThe tone is one half step higher.
Bb13#11
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Notes: Bb - D - F - Ab - C - E - G
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Bb13#11 polychord
Explanation: The image below shows a polychord version of the Bb13#11. The chord is played in two parts with both hands.
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Polychord Bb7 (LH), C (RH)