Warner Brothers, Paramount Pictures and Metro-Goldwyn-Mayer — violated a collective bargaining agreement that music for Hollywood films would be produced in the United States or Canada. "The disregard for the livelihood of professional musicians by these companies has to stop," said Ray Hair, president of the 80,000-strong American Federation of Musicians of the United States and Canada. The lawsuit pointed to the score for last year's hit science fiction epic "Interstellar," which was directed by Christopher Nolan and starred Anne Hathaway, Michael Caine and Matthew McConaughey.

Source: Yahoo Music
Link: Musicians sue US film studios for outsourcing