Four organ players, with their own pressures and abilities, prepare for the Canadian International Organ Competition in Montreal.

For 30 years, Marion Stokes records American television, creating a comprehensive archive of the media on 70,000 VHS tapes that are being digitized for future generations.

Historically black colleges and universities play a pivotal role in shaping American history, culture and national identity.

Since its 1988 premiere, this critically acclaimed documentary series has presented hundreds of films that put a human face on contemporary social issues by relating a compelling story in an intimate fashion. "POV" has won virtually every major film and broadcasting award available, including 34 Emmys, 19 Peabody Awards and three Oscars.

"Frontline" offers an unflinching and compelling look at complex, vital and often-controversial subjects. Each broadcast consists of a long-form news documentary. Topics run the gamut -- from Bernie Madoff's intricate fraud and prisoner abuse at Abu Ghraib, to AIDs, racial issues and Wal-Mart's effect on the U.S. economy.

As part of its 30th anniversary celebration, ESPN looks back at notable sports happenings that occurred from 1979 to 2009 with this documentary series featuring 30 films from some of Hollywood's finest directors and producers. Peter Berg, Barry Levinson, John Singleton, Spike Jonze, Dan Klores, Barbara Kopple, Ron Shelton and Albert Maysles are among the filmmakers involved, and the stories told include the shocking trade of Wayne Gretzky in 1988, the Baltimore Colts' nighttime move in 1984, Reggie Miller's rivalry with the New York Knicks, the death of Len Bias in 1986, a profile of George Steinbrenner and his family business, and a look at Michael Jordan's attempt at a baseball career. A new series of 30 films premiered in October 2012 with "Broke," about the challenges athletes face in managing their money.

Since its premiere in 1986, this Emmy-winning documentary series has presented hundreds of hours comprising profiles of outstanding American cultural artists. Past subjects have included Charlie Chaplin, Helen Hayes, pop icon Andy Warhol, singer Billie Holliday and composer-conductor Leonard Bernstein.

This award-winning series presents compelling untold stories and covers a wide array of provocative subjects. "Explorer" aired for 25 years -- the longest-running documentary series in cable TV history -- before being relaunched in 2015 after a five-year hiatus. Each monthly episode of the new "Explorer" takes a similar deep dive inside a story from the pages of a recent National Geographic magazine issue, taking viewers not only to the most remote corners of the globe but also to the furthest reaches of the mind and deepest crevices of history -- on urgent missions of discovery.