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A major (uncountable)

(music) The major key with A as its tonic, with the notes A, B, C♯, D, E, F♯, and G♯, the key signature of which has three sharps.

${\key a \major a' b' cis'' d'' e'' fis'' gis'' a''2}$
(music) The major chord with a root of A.

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