Franco Corelli was an Italian tenor active in opera from the 1950s to 1976. He was noted for his charismatic stage presence and physical attractiveness as well as his powerful voice. Wikipedia
Possibly some of the keenest commentary on Corelli that I've yet read is Paul Jackson's in his second volume on the MET b'casts: he spotlights this mercurial aspect to Corelli's singing right away. www.operacast.com/corelli.htm
The definitive Wikipedia entry for Franco Corelli. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Franco_Corelli