Lanza began studying to be a professional singer at the age of 16. After appearing at the Hollywood Bowl in 1947, Lanza signed a seven-year film contract with Louis B. Mayer, the head of Metro-Goldwyn-Mayer who saw his performance was impressed by his singing. Prior to that, the adult Lanza had sung only two performances of an opera. The following year (1948), however, he sang the role of Pinkerton in Puccini's Madama Butterfly in and New Orleans.
His film début was in That Midnight Kiss (1949) with Kathryn Grayson and Ethel Barrymore. The following year, in The Toast of New Orleans, his featured popular song "Be My Love" became his first million-selling hit. READ MORE HERE https://en.wikipedia.org/wiki/Mario_Lanza