This documentary captures the overflowing energy and activity of one today's greatest composers, Philip Glass, and allows us to follow him from New York to London and from Paris to Boston. He speaks about his beginnings, his moving to Paris for two years of intensive study with Nadia Boulanger, his meeting with Indian musician Ravi Shankar and director Robert Wilson, who had a deep influence on his career. The film also shows him at work on the last details of his opera The Sound of a Voice, directed by Robert Woodruff and conducted by Alan Johnson. Éric Darmon's camera, with its poetic shots and original framings, takes us for a musical journey into seven months of the life of the composer who, rising from the underground scene of the seventies, brought on a revolution in modern theater.