Here's one of the best book to movie adaptions out there, which isn't surprising since Peter S. Beagle wrote both the book and the screenplay. I wish I had seen it when it was theatrically released in 1982, but I don't remember it coming to our area. It was one of the many Japanese/American co-productions that came out around that time period.
It's got a great cast, great animation and uh... well. America did the soundtrack. I can't say I'm a fan of it, as their sound and popularity was waning at that point in time. I'm sure the price was right for all parties concerned though. It's not awful, but I've never been a fan of the band. I am a fan of both the movie and the book.