"Rivalry in Music Callas vs. Tebaldi" is a fascinating documentary that delves into the storied rivalry between two of the greatest postwar opera divas, Maria Callas and Renata Tebaldi. Although not altogether true, Callas, known as "The Tigress," was dramatic and wild, while Tebaldi, with her pure voice, was seen as angelic. The rivalry was fueled by the media, which often exaggerated their differences and conflicts. This documentary also explores the opera houses in New York and Milan.