E♭ major has 3 flats — B♭, E♭, 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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In any flat key the second-to-last flat names the key. E♭ major's flats are B♭, E♭, A♭, so the second-to-last, E♭, is the tonic — E♭ major.
The E♭ major scale runs E♭, F, G, A♭, B♭, C, D. Every flattened 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 — 3 flats — 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 3 flats — B♭, E♭, A♭.
The relative minor of E♭ major is C minor — it shares the identical key signature (3 flats).
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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