Howdy Bill,

The extent of my knowledge about this is posted above:
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To get a .mus file into Composer, you would have to convert it to .mid first. I just did a quick search on ".mus to .mid", and there are other programs that use the .mus extension, so if you go looking for a tool, do be careful that it's for the right filetype!
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I don't personally know of any tool, and I didn't find one in the first couple of pages of search results for ".mus to .mid".

Anybody else know of an inexpensive way to get a .mus (Finale) file to .mid?

ttfn,
Sherry