A minor has no sharps or flats. Here's the signature on the staff, the full scale, its relative major, and the trick to recognize it instantly.
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A minor carries the same empty signature as its relative major, C major. Because nothing is fixed by the key, A-minor writing leans on an accidental — usually a raised G♯ — to give the scale its leading tone.
The A minor scale runs A, B, C, D, E, F, G. Every note in the piece takes the key's accidentals automatically, which is exactly what the signature saves you from writing note by note.
A minor shares its signature — no sharps or flats — with its relative major, C 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.
A minor has no sharps or flats.
The relative major of A minor is C major — it shares the identical key signature (no sharps or flats).
The A minor scale is A, B, C, D, E, F, G.
Keep practicing: key signature quiz · circle of fifths · key trainer
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