So far the best places I've been able to find music files to edit into maps are these:
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http://www.laernu.com/unrealfiles/Music/
Don't download the ones that start with 'ARC'. Whoever made those shamelessly promoted himself into the music.
http://sektornelsona.no-ip.org:9000/index.php?dir=Music/
Gotta be careful with this last one. You can only download 1 file at a time. If you try for more...well, let's just say it would be bad.
*ahem*
I've googled without a lot of luck, and checked the other places I usually get ut99 maps & skins & stuff without much luck.
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What're some other good sources for .umx files?
here http://uz.ut-files.com/
remember Unreal.Tournament.Original.Soundtrack.MP3 http://unrealtournament.99.free.fr/utfiles/index.php?dir=sound%20ut/&file=Unreal.Tournament.Original.Soundtrack.MP3l.rar
(http://pics.livejournal.com/black_beast/pic/0011xhbb.gif)