There are only a few films that I can say that I've enjoyed watching more than once and fewer that I'd watch again. This is one of them. Maybe the only one.
Yes, the music is nice and all- that's what most people focus on when discussing it. But there's a lot more than that. It's remarkably current in it's illustration of the situation that we, as a species have put ourselves in, despite the fact it was released 31 years ago.