Andrew Litton, a native New Yorker, has been announced as New York City Ballet’s next music director. He will begin his tenure in fall 2015. Litton is the music director of the Colorado Symphony Orchestra and the Bergen Philharmonic Orchestra in Norway. He will succeed Fayçal Karoui, who held the post from 2006 through 2012. Andrews Sill, who has been the company’s interim music director for the past two years, will become its associate music director.