Street Serenade.

While on tour somewhere in Italy, a famous German pop singer loses his voice. All tickets for the concerts have long been sold out. Someone from the "Star's" entourage finds a young local guy who used to walk around the city singing in a very similar voice. From then on, the pop star stood on stage in front of the microphone, only opening his mouth, while the unknown street singer sang for him, standing in front of the microphone behind the scenes. At the end of the film, the star's voice returns, and he begins to sing solo and in a duet with the young singer.