The G-flat dominant thirteenth chord (abbreviated "Gb13 chord") is a seven-note chord consisting of the notes G, B, D, F, A, C, and E. The chord is formed by adding a thirteenth to a G-flat dominant eleventh chord.

In practice, the fifth (D) and eleventh (C) are often omitted from the Gb13 chord to avoid a very dissonant sound, and because it's not always possible to play all notes simultaneously.

Name
G-flat dominant thirteenth chord
Notes
G B D F A C E
Intervals
1 3 5 7 9 11 13
Chord symbol
G13
Type
heptad (seven-note chord)

Gb13 chord on piano

Gb13 chord on guitar

Gb13 chord on ukulele

Gb13 chord on the staff