G♭ major has 6 flats — B♭, E♭, A♭, D♭, G♭, C♭. Here's the signature on the staff, the full scale, its relative minor, and the trick to recognize it instantly.
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In any flat key the second-to-last flat names the key. G♭ major's flats are B♭, E♭, A♭, D♭, G♭, C♭, so the second-to-last, G♭, is the tonic — G♭ major.
The G♭ major scale runs G♭, A♭, B♭, C♭, D♭, E♭, F. Every flattened note in the piece takes the key's accidentals automatically, which is exactly what the signature saves you from writing note by note.
G♭ major shares its signature — 6 flats — with its relative minor, E♭ minor, a minor third below the tonic. They use the same seven pitches; what tells them apart is which note the music settles on and treats as home.
G♭ major has 6 flats — B♭, E♭, A♭, D♭, G♭, C♭.
The relative minor of G♭ major is E♭ minor — it shares the identical key signature (6 flats).
The G♭ major scale is G♭, A♭, B♭, C♭, D♭, E♭, F.
Keep practicing: key signature quiz · circle of fifths · key trainer
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