Tom Cruise "blew away" 'Rock of Ages' music producer Adam Anders with the power of his voice.
The actor plays 80s rocker Stacee Jaxx in the movie adaptation of the classic musical - which also stars Russell Brand and Catherine Zeta-Jones - and although his vocals were shaky to star with, he eventually learnt how to do amazing things with his voice.
Adam said: "Now he's like a seven, but he started off at a one. He had never sung in his life. He was like, 'I need to know that I can do this before I sign on.' So I went to his house to hear him sing and even though he was completely green as a singer, his vocal cords were amazing.
"He had this voice that blew me away. It was the most powerful voice I had ever heard. So loud. He could do anything and go as high as we wanted.
"It was like a kid discovering he had a new toy. I left there super-pumped knowing that not only could we make him pass as a singer in the movie, but we would blow people away with what he could do."
Adam believes Tom initially began filming with a sense of nerves but his self-belief grew as the movie continued shooting.
He added to The Hollywood Reporter: "His confidence kept growing as we worked together. I think he started off a little nervous, as anybody would who has never done this, but he just bought it 110 per cent.
"He works harder than anybody I've ever met in my life. By the end of this movie, the guy was just phenomenal. I remember telling him, 'You're a singer!' " - Bang Showbiz