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In page Deanna Durbin:

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In early 1935, Metro-Goldwyn-Mayer was planning a biographical film on the life of opera star Ernestine Schumann-Heink and was having difficulty finding an actress to play the young opera singer. MGM casting director Rufus LeMaire heard about a talented young soloist performing with the Ralph Thomas Academy and called her in for an audition. Durbin sang "Il Bacio" for the studio's vocal coach, who was stunned by her "mature soprano" voice. She sang the number again for Louis B. Mayer, who signed her to a six-month contract.[2]