I remember someone mentioned quite a while back that Ligeti sued MGM over using his music in 2001. I had never heard that, but I did find this quote on Ligeti's website.... This is Ligeti:
"I liked the film. The way it used my music I accept artistically . . . In the l970s I saw a book on the making of 2001 and read that Ligeti had successfully sued MGM for taking his music. But it’s not so. I never sued them. MGM wrote me such nice letters. They said Ligeti should be happy; he’s now famous in America."
I was worried about that, because I am a bit of a Ligeti fan, and at the same time I am a Kubrick fan. I would hate to think that Kubrick would have used his music illegally.
If you have not heard Ligeti's music (especially his Requiem), I highly recommend it. He is definately a living master. His music is so powerful.