Notes used in G♭ Dominant 7 Third Inversion Chord:
F♭ + G♭ + B♭ + D♭
Dominant 7 chords are played combining a root, major third, perfect fifth, and minor (♭) seventh notes of the root note's major scale.
Dominant 7 Third Inversion Chord Formula:
7♭ + 1 + 3 + 5