they have a officail website to go to with info about the movie it also says the sound track you can already buy on amazon
as has parts about the soundtrack and the producer of it talks about keiras sing etc..
http://www.theedgeoflove.co.uk/
he also says about one sence were keira has to sing in a tube station were they have to hide from the bombs in the war.
which sounds like the clip we see in the video everyones saw on youtube and perezhiltons website and also the one KCKF posted
so all the idiots that think thats not her can eat there own words up