C♯ minor has 4 sharps — F♯, C♯, G♯, D♯. Here's the signature on the staff, the full scale, its relative major, and the trick to recognize it instantly.
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C♯ minor borrows its 4 sharps straight from its relative major, E 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 C♯ minor scale runs C♯, D♯, E, F♯, G♯, A, B. 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.
C♯ minor shares its signature — 4 sharps — with its relative major, E 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.
C♯ minor has 4 sharps — F♯, C♯, G♯, D♯.
The relative major of C♯ minor is E major — it shares the identical key signature (4 sharps).
The C♯ minor scale is C♯, D♯, E, F♯, G♯, A, B.
Keep practicing: key signature quiz · circle of fifths · key trainer
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