To hear Pavarotti sing, go to the Fine Arts database page and select Naxos. Do a search on "Pavarotti" to find sound recordings you can listen to online.
If you'd like to read more about opera, come into the Library and check out one of these books:
First nights at the opera. ML1720 .K45 2004
Opera : a critic’s guide to the 100 most important works and the best recordings. ML156.4.O46 T66 2004
Opera for everyone : a historic, social, artistic, literary, and musical study. ML1700 .G86 2004
The NPR curious listener’s guide to opera. ML1700 .B33 2002