For all a director’s authority, film is the most collaborative art form, and Glass is surely the most collaborative artist in history. His dozens of movies are only a small part of his prolific output, which includes music for well over 50 operas, dance works and music theater pieces; 11 symphonies; hoards of concertos and other orchestra and chamber pieces. All that and the reams of music for the Philip Glass Ensemble, which he founded 49 years ago and is still going strong, as it demonstrated at the Ace on Sunday.