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Choral Public Domain Library
http://cpdl.snaptel.com/
50+ MIDI files. Also many Finale and sheet music files.
Completorium
http://republika.pl/completorium/
125+ files of early Polish Music; essays and indexes.
Greg Scheer's Choral Archives
http://ccel.org/music/choral/choral.html
20+ files. Many with Finale format files or text.
The Silvis 'Woodshed
http://www.channel1.com/users/gsilvis/
500+ MIDI files.