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