B♭ major has 2 flats — B♭, E♭. 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. B♭ major's flats are B♭, E♭, so the second-to-last, B♭, is the tonic — B♭ major.
The B♭ major scale runs B♭, C, D, E♭, F, G, A. 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.
B♭ major shares its signature — 2 flats — with its relative minor, G 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.
B♭ major has 2 flats — B♭, E♭.
The relative minor of B♭ major is G minor — it shares the identical key signature (2 flats).
The B♭ major scale is B♭, C, D, E♭, F, G, A.
Keep practicing: key signature quiz · circle of fifths · key trainer
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