I noted this review of Respighi's cantata Christus...
http://www.musicweb-international.com/classrev/2007/Mar07/Respighi_Christus_LBD125.htm (http://www.musicweb-international.com/classrev/2007/Mar07/Respighi_Christus_LBD125.htm)
...and realised it was a reissue of a recording originally on Claves - of a work about which I knew absolutely nothing. Anyway, it turns out to be beautiful piece, richly Romantic in style and with some operatic-style writing for the soloists. Fortunately it can also be auditioned complete on YouTube:
http://www.youtube.com/watch?v=R7bNje8XKlg (http://www.youtube.com/watch?v=R7bNje8XKlg)