I went to the site linked in the first posting, and the version of O Sapientia there was apparently an .rm file.

What sort of song is an .rm file?

Our choir is having a concert this Sunday, and we are doing an absolutely rip-snorting arrangement of O Come O Come Emmanual which has an antiphonal choir and a rich, exciting piano part. We have added a string bass, and we are going to knock their socks off!

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It's a RealMedia file - it's plays on RealPlayer. Just click it and see if it plays.
-Joe Offer-