'I feel the movie is a very positive, sort of uplifting tale', she explains. 'I got to the end of shooting a film called 'Anna Karenina' and realised that in pretty much everything I'm doing I'm either dying or dead or horrendous in some way, so I wanted to do something that was very positive and lighter.' She also talks about her struggles with getting to grips with the musical side of her character. 'I sing, that was terrifying', she admits. 'I'm not a singer. Everyone was very kind and I met some very lovely people who worked a lot with me to try and figure out how to do that and what would sound right and I think we found something that's pretty good.'