B major has 5 sharps — F♯, C♯, G♯, D♯, A♯. Here's the signature on the staff, the full scale, its relative minor, and the trick to recognize it instantly.
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The fastest way to spot a sharp key is the last sharp: it always sits a semitone below the tonic. B major's final sharp is A♯, and a semitone above that is B — the key. Count 5 sharps and you have B major every time.
The B major 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 major shares its signature — 5 sharps — 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 5 sharps — F♯, C♯, G♯, D♯, A♯.
The relative minor of B major is G♯ minor — it shares the identical key signature (5 sharps).
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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