Gb sixth/ninth chord
Gb6/9 chord for piano with keyboard diagram.
Explanation: The G flat sixth/ninth is a five note chord. Due to practical circumstances, however, the fifth (Db) is often omitted and/or the chord is played inverted. The chord is abbreviated Gb6/9.
Theory: The Gb6/9 chord is constructed with a root, a major third, a perfect fifth, a major sixth and a major ninth.
Notes: Gb - Bb - Db - Eb - Ab