Gb7-9 (Gb7b9) altered chord
Altered Gb chord for piano presented by keyboard diagrams.
Explanation: The Gb7-9 alter the Gb9 by the change of one note. The chord name can also be written as Gb7b9 or Gb7(b9).
Theory: The Gb7-9 are identical with the Gb9 except that the major ninth is flattenedThe tone is one half step lower.
Notes: Gb - Bb - Db - E - G / Gb - Bb - Db - E - Abb