Since its overwhelming success on Broadway forty years ago, Hair: let the sun shine in has inspired generations with its messages of love, non-violence and liberation. This definitive and entertaining documentary highlights the continuing relevance of the show and its still radical, transformative power. In preparation for its fortieth anniversary, the show's author and co-creator Jim Rado rehearses a troupe of young performers for a new production whose vibrant energy brings Hair's fantastic score to life once again. A wealth of archival footage covers US and international productions as well as conveys a portrait of an era, a generation and its politics. Original interviews and new segments feature Milos Forman, Keith Carradine, Ben Vereen, Melba Moore, author James Rado, composer Galt MacDermot, director Tom O'Horgan and others. With the US today again mired in a prolonged and unpopular war, Hair inspires a new generation with its cry for peace, love and change.