Notes used in G♭ Dominant 7 First Inversion Chord:
B♭ + D♭ + F♭ + G♭
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 First Inversion Chord Formula:
3 + 5 + 7♭ + 1