United Kingdom, Jan. 11 -- Angelina Jolie found starring in 'Maria' to be a therapeutic experience.

The Oscar-winning actress plays opera singer Maria Callas in the biographical drama film, and Angelina has revealed that it was one of the most impactful roles of her career.

Angelina, 49, told Sky News: "To be very candid, it was the therapy I didn't realise I needed. I had no idea how much I was holding in and not letting out.

"So, the challenge wasn't the technical [side of opera], it was an emotional experience to find my voice, to be in my body, to express. You have to give every single part of yourself."

The movie tells the story of Maria in the seven days before her death in 1977. And Angelina appreciated having the support of he...