Musicians have made similar demands in 2008[1]. That includes Christopher Cerf, one of the Sesame Street composers. He features in a documentary Aljazeera made about this[2]. I seem to remember he also asked for royalties but was unsuccessful, but I can't find a reference to that.

[1] http://www.webcitation.org/query?url=http%3A%2F%2Fwww.google...

[2] http://www.dummymag.com/videos/watch-al-jazeera-s-songs-of-w...