Answer
Renata Tebaldi made her debut at La Scala in 1946, portraying the role of Elena in Boito's Mefistofele. Her performance was met with critical acclaim, launching her career as one of the most celebrated opera singers of the 20th century. Tebaldi's voice was renowned for its beauty, purity, and power, and she became particularly associated with the roles of Verdi and Puccini heroines.