B minor has 2 sharps — F♯, C♯. Here's the signature on the staff, the full scale, its relative major, and the trick to recognize it instantly.
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B minor borrows its 2 sharps straight from its relative major, D major. Beyond the signature, minor keys typically raise the seventh degree into a leading tone, so expect an extra accidental in the music that the key signature never shows.
The B minor scale runs B, C♯, D, E, F♯, G, A. Every sharpened note in the piece takes the key's accidentals automatically, which is exactly what the signature saves you from writing note by note.
B minor shares its signature — 2 sharps — with its relative major, D major, a minor third above the tonic. They use the same seven pitches; what tells them apart is which note the music settles on and treats as home.
B minor has 2 sharps — F♯, C♯.
The relative major of B minor is D major — it shares the identical key signature (2 sharps).
The B minor scale is B, C♯, D, E, F♯, G, A.
Keep practicing: key signature quiz · circle of fifths · key trainer
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