This is the movie that won the Oscar for best song. Good film. Different, but in a good way. It's kind of similar to Lars and the Real Girl in that you think it's going to unfold in the stereotypical, formulaic manner, but it doesn't. I'll say no more, lest I spoil it for someone.
It also provides an interesting glimpse at musicians and the process they go through in creating music.
"Purgatory's kind of like the in-betweeny one. You weren't really shit, but you weren't all that great either. Like Tottenham."
I'll try being nicer...if you'll try being smarter.