Pete Seeger: The Smithsonian Folkways Collection is a six-CD collection of Seeger's previously unreleased music, accompanied by a 200-page book. Diana Davies/Courtesy of the artist hide caption

Pete Seeger
Joan Baez performing at the the Civil Rights March on Washington in 1963. She sang "We Shall Overcome" and "Oh Freedom." Express Newspapers/Getty Images hide caption
Federal Judge Rules First Verse Of 'We Shall Overcome' Public Domain
Civil rights leaders, including Dr. Martin Luther King, Jr., sing "We Shall Overcome" at the conclusion of the Selma to Montgomery civil rights march in 1965. Stephen F. Somerstein/Getty Images hide caption
Pete Seeger in New York City. 2009. Steve Mack/FilmMagic hide caption
Listen To 'Sing Out,' A Special From 2005
Pete Singer performs at a convention of The Public Citizen in Washington, DC in 1981. Mickey Adair/Getty Images hide caption
Pete Seeger performs during a concert marking his 90th birthday at Madison Square Garden in New York on May 3, 2009. Timothy A. Clary/AFP/Getty Images hide caption
Pete Seeger was an environmentalist, an activist and the most prominent folk musician of his generation. Neilson Barnard/Getty Images hide caption
Toshi Seeger with her husband, folk singer Pete Seeger, in 2009. Bennett Raglin/Getty Images hide caption
Pete Seeger released two albums this year: Pete Remembers Woody (a Woody Guthrie tribute) and A More Perfect Union, a collaboration with guitarist Lorre Wyatt. David Bernz/Courtesy of the artist hide caption