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A Key in which music is played, consisting of two sharps or flats.
D major scale:

1 2 3 4 5 6 7 8
D E F# G A B C# D
by Levi Morris June 24, 2006
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3
The definitive major triad after C Major.

~The Oxford Companion To Music
Press key D <hold> key F# <hold> A <hold>
Hold all three together --a D Major Chord!
by chuckie38 June 15, 2008
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