Where could I obtain the rights to a piece of music by Gy�rgy Ligeti?

if you are using it for a film to be submitted for film festivals, you will need a release form or something to prove you have rights to the music used. I would suggest googling for music that is free from royalties. else try this a href="http://www.jewelbeat.com/" rel="nofollow"http://www.jewelbeat.com//a for alternatives. You won't get Ligeti's music but there is always some other alternatives.