E major has 4 sharps — F♯, C♯, G♯, D♯. 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. E major's final sharp is D♯, and a semitone above that is E — the key. Count 4 sharps and you have E major every time.
The E major 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 major shares its signature — 4 sharps — with its relative minor, C♯ 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.
E major has 4 sharps — F♯, C♯, G♯, D♯.
The relative minor of E major is C♯ minor — it shares the identical key signature (4 sharps).
The E major scale is E, F♯, G♯, A, B, C♯, D♯.
Keep practicing: key signature quiz · circle of fifths · key trainer
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