E minor has 1 sharp — F♯. Here's the signature on the staff, the full scale, its relative major, and the trick to recognize it instantly.
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E minor borrows its 1 sharp straight from its relative major, G 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 E minor scale runs E, F♯, G, A, B, C, D. 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.
E minor shares its signature — 1 sharp — with its relative major, G 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.
E minor has 1 sharp — F♯.
The relative major of E minor is G major — it shares the identical key signature (1 sharp).
The E minor scale is E, F♯, G, A, B, C, D.
Keep practicing: key signature quiz · circle of fifths · key trainer
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