No frills directory. MIDI files of hymn tunes. Some listed by tune, others by title. Tad Inoue, Church Music Research Tools . English and Japanese.
Site also has directories of Internet resources related to the study of church music.
Plays a MIDI file without asking, but a console is provided. Rick Kephart, Gregorian Chant Notation . Explains how to read Gregorian chant. Must have graphics capability. English and German.