A major seventh chord is a major triad with an added seventh interval:
◊ Dominant 7th
A G♭7 has an added minor seventh: G♭ – B♭ – D♭ – F♭
◊ Major 7th
A G♭maj7 has an added major seventh: G♭ – B♭ – D♭ – F
◊ Dominant 7th Flat Five
A G♭7♭5 is a G♭7 with a diminished fifth: G♭ – B♭ – D♭♭* – F♭
◊ 7/Suspended Fourth
A G♭7sus4 is a G♭7 with a P4 instead of a major third: G♭ – C♭ – D♭ – F♭
* see double-flat
♫ More Piano Chords:
Gbmaj ▪ Gbma7 ▪ Gbma9 | Gbmin ▪ Gbm7 ▪ Gbm9 | Gbdim ▪ Gb°7 | Gbaug ▪ Gb+7 | Gbsus2 ▪ Gbsus4
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