Answer:
You can't really. It's like comparing apples and pears.

MP3 is a recording of raw sound. A mus is a music file where the only things stored in the file are trigger data. This means that the file only knows when which instrument plays, how it plays and so on.
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First answer by Eviscerator. Last edit by Eviscerator. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 2 [recommend question].