C♭ major has 7 flats — B♭, E♭, A♭, D♭, G♭, C♭, F♭. 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. C♭ major's flats are B♭, E♭, A♭, D♭, G♭, C♭, F♭, so the second-to-last, C♭, is the tonic — C♭ major.
The C♭ major scale runs C♭, D♭, E♭, F♭, G♭, A♭, B♭. 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.
C♭ major shares its signature — 7 flats — with its relative minor, A♭ 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.
Neighboring keys on the circle of fifths
C♭ major has 7 flats — B♭, E♭, A♭, D♭, G♭, C♭, F♭.
The relative minor of C♭ major is A♭ minor — it shares the identical key signature (7 flats).
The C♭ major scale is C♭, D♭, E♭, F♭, G♭, A♭, B♭.
Keep practicing: key signature quiz · circle of fifths · key trainer
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