An internationally known Greek-American opera star, Callas was celebrated less for her voice than for her electrifying stage presence and mastery of difficult roles. Her career blossomed in the 1940s. Offstage, her fiery temperament, dramatic love life, and demanding personality earned her the reputation of a consummate diva. During her media-fueled rivalry with soprano Renata Tebaldi in the 1950s, Callas was quoted as saying that comparing her to Tebaldi was like comparing what two things? Discuss
Source: The Free Dictionary