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A Crash Course on Musical Transposition

Transposition is a musical term for moving notes higher or lower to change key. So why do arrangers transpose? Why not keep everything in it's original key and for that matter why don't composers always write in C, as it has no flats or sharps? Choosing the key of a piece is somewhat like choosing a seat in an airplane. Though all the seats are sort of the same, everyone has preferences, for various reasons.