Portrait of Renata Tebaldi.

Renata Tebaldi (soprano) was known as "La voce d'angelo", or "The voice of an angel", because of her beautiful voice. The nickname helped to be considered one of the best sopranos in history and becoming a great diva. In 1963, she suffered minor vocal problems, which made her take a break of her career for a short period of time and re-educate her voice. She was back on the stage in the next year, but her voice gained a little weight.