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1.
A Key in which music is played, consisting of no sharps or flats.
C Major scale:

1 2 3 4 5 6 7 8
C D E F G A B C
by Levi Morris June 24, 2006
 
2.
Any large group consisting of only white people.

Because the C Major scale uses only white keys.
Guy 1: Is this party gonna be in C Major?
Guy 2: No
Guy 1: Damn how many sharps?
by maestro4 January 12, 2010