I don't remember all the details of this movie but from what I can remember it was about an orphan that wanted to be a rock star. It was animated and had real rock songs for the sound track. I believe I saw it on hbo several years ago

Perhaps you're thinking of Ralph Bakshi's "American Pop"

American Pop - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/American_Pop)

American Pop (1981) - Trivia (http://amazon.imdb.com/title/tt0082009/trivia)