A person who arranges things; particularly in music, a composer who adapts a musical composition for different instruments or voices.
From 'arrange' + '-er' (suffix for agent nouns). Arrange comes from Old French 'aranger' meaning to put in order.
Musical arrangers are often invisible heroes—when you hear an iconic arrangement of a famous song, you might not know it was rearranged by someone else entirely, but great arrangers can completely transform a piece and make it more famous than the original composition.
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