Philip Glass composed the minimalist score for 'The Thin Blue Line', a documentary film directed by Errol Morris.

Michael Brook used ambient music to create an atmospheric and immersive soundscape in 'Grizzly Man', a documentary film about Timothy Treadwell's fatal encounters with grizzly bears.

Ennio Morricone composed the score for 'The Fog of War', a documentary film directed by Errol Morris, which explores the life and career of former U.S. Secretary of Defense Robert McNamara.

Antonio Pinto served as the music supervisor for 'Amy', a documentary film about the life and career of British singer-songwriter Amy Winehouse.

Trent Reznor and Atticus Ross composed the score for 'The Social Network', a biographical drama film about the founding of Facebook.

Philip Glass incorporated traditional Japanese music into the score for 'Jiro Dreams of Sushi', a documentary film about the life and work of sushi master Jiro Ono.

Hans Zimmer composed the score for 'Planet Earth', a documentary series produced by the BBC Natural History Unit.

Michael Nyman composed the score for 'Man on Wire', a documentary film about Philippe Petit's high-wire walk between the Twin Towers of the World Trade Center in 1974.

Gustavo Santaolalla composed the score for 'The Motorcycle Diaries', a biographical drama film about the early life of Che Guevara.

Sixto Rodriguez, the subject of the documentary film 'Searching for Sugar Man', is a singer-songwriter whose music was rediscovered in South Africa after decades of obscurity.

Jóhann Jóhannsson composed the score for 'Sicario', a crime thriller film directed by Denis Villeneuve.

J. Ralph composed the score for 'The Cove', a documentary film about the dolphin hunt in Taiji, Japan.

Ryuichi Sakamoto composed the score for 'The Last Emperor', a biographical drama film about the life of Puyi, the last emperor of China.

Alex Heffes composed the score for 'Touching the Void', a documentary film about the true story of Joe Simpson's mountaineering accident in the Peruvian Andes.

Mark Isham composed the score for 'Blackfish', a documentary film about the captive orca Tilikum and the dangers of keeping cetaceans in captivity.