Australian singer Sia has released her song 'Never Give Up' which features as the main theme song for the upcoming film Lion.

The film centres on a young, lost Indian boy who gets adopted by an Australian family. As the song suggests, the boy is relentless in trying to find his real family and first home after twenty-five years away from them.

Lion, featuring Nicole Kidman and Dev Patel, is set to hit cinemas November 25.