"Walk Hard - The Dewey Cox Story" is a good parody of musician bios like Walk The Line. It's not the greatest comedy ever made, perhaps, but it has a lot of good points and solid lines. It particularly skewers the sentimentality such movies sometimes veer into.
And it has this too-short appearance of Jewel. I had no idea anybody could put so much beauty and sex-appeal (and humor) into one sung word!
(I'm amazed at the quality of this clip, not the least the sound. I filmed it off my HD TV, hand-held! (Ooh, short clip and part of a review, hope this comes under "fair use"...). It was filmed with Panasonic GH2, which is particularly aimed at being a good video camera, and it seems they succeeded very well with the built-in mics.)