Here you'll find some gorgeous audio files from St. Clement's in Philadelphia. The most recent offering is the Missa Canonica, by Johannes Brahms, for Lent III; here's the Kyrie. The George Malcolm mass, Missa ad Præcepe, sung for Epiphany of this year, is there, too. Here's the lovely Kyrie from that one.
All of Mozart's Missa Solemnis in C, for Corpus Christi is there, too, along with Elgar's Ave Verum and O Salutaris Hostia, a lovely piece I've never heard before.
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