In music notes, what are the letters called? (Like A,B,G,E...etc)?!

Question: In music notes, what are the letters called!? (Like A,B,G,E!.!.!.etc)!?
Answers:

Pitches are named after the first seven letters of the alphabet (A B C D E F G)!.

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http://jmdl!.com/howard/music/keys_scales!.!.!.
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