Sor Ye Ye

Sor Ye Ye is a 1967 musical film. The movie is a coproduction between Spain and Mexico, starring Hilda Aguirre, Manuel Gil and Enrique Guzmn. The movie is loosely based on the novel La hermana San Sulpicio.

Meanwhile, the convent is going through finantial difficulties, and the nuns barely have enough to feed the children, so they are forced to suffer hunger themselves. Mara fixes the situation getting a voluntary donation from her aunt to supply the convent with food. Her aunt flew into a rage and demanded her to look for money elsewhere. And they desperately need money, first to operate a blind child, and then to prevent the closure of the convent itself. Mara decides, after asking permission from mother superior and the bishop, to go as a singer to the Sanremo Music Festival trying to win the first prize and the money to save the convent forever. However, she will have to compete there with Ernesto, who also wants to win the competition, and meanwhile, it seems that the doctors feelings towards her are getting stronger, and Mara has increasing doubts about her religious vocation...At the time of release, Hilda Aguirre was introduced as the main and only star of the film and as the song performer. Soon, that was proven to be false, because the singing voice was performed by a then unknown Estela Nez, who at the time was forbidden to reveal she was the singer, and she was also forbidden to sing the songs in public. However, a couple of years later, Estela Nez rose to stardom in Mexico, and later Enrique Guzmn revealed in an interview that Estela Nez was the real singer of the film. ........

Source: Wikipedia