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Why is Trumpet mentioned as B flat pitch ? How it becomes suitable for C scale ?

marked as duplicate by Carl Witthoft, Tim, MrTheBard, guidot, Shevliaskovic May 19 '15 at 12:02

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The first question already has an answer. The second is that one plays the notes in the key of D on the music, which come out sounding as if they belong to the C scale.

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