One of the most influential folk trios ever to take the stage, Peter, Paul and Mary demonstrate the extent of their staying power in this packed disc. Includes vintage footage of live performances of "If I Had a Hammer" from the 1963 Civil Rights March on Washington; "Leaving on a Jet Plane," sung by the trio with John Denver in 1970; and "The Great Mandala (The Wheel of Life)" from a 1970 PBS documentary.