Ah .. I have not seen that movie which would explain why I didn't recognize it.
Technically the orchestra is only performing the music - it would have been composed by someone (for example, like Star Wars or many many other great movie soundtracks are by John Williams). In the case of Hard Rain it looks like our guy is Christopher Young. In this case it it solely a movie soundtrack piece so it might be more kosher to attribute as "'Hard Rain' by Christopher Young, performed by the London Metropolitan Orchestra".
More info about Chris Young if you're interested:
http://imdb.com/name/nm0002366/
http://www.answers.com/topic/christopher-young
Sorry .. I guess I'm a classical music geek so you just have to put up with my fussiness once in a while.
