20 of 20: Bob Dylan and others sing at a benefit at Madison square garden in New York on May 9 , 1974, in honor of the late Chilean President Salvan Allende, show, from left, are: actor Dennis Hopper, Arlo Guthrie, film director Melvin Van Peebles (behind Guthrie), Melanie, Dylan and Dave Van Ronk. (AP Photo/Ray Stubblebine)

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