He is one of America's true giants of the musical stage: renowned Broadway lyricist and composer Stephen Sondheim. This intimate documentary explores the life and career of the stage legend through six of his best-known songs: 'Something's Coming,' 'Opening Doors,' 'Send in the Clowns,' 'I'm Still Here,' 'Being Alive,' and 'Sunday.' Directed by award-winning Broadway director and playwright James Lapine, the film is predominantly told by Sondheim himself as it weaves together dozens of interviews from throughout his career, along with archival performances of his classics.