Including now-iconic covers of Pete Seeger’s “If I Had a Hammer (Hammer Song)” and “Where Have All the Flowers Gone?,” the record went double-platinum with more than 2 million copies sold.

Yarrow had bladder cancer for the past four years ... to embrace the work of such folk-music icons as Woody Guthrie and Pete Seeger.Upon graduating from Cornell University in 1959, he returned ...

Yarrow had been battling bladder cancer for the past four years ... tribute concert for folk icon and civil rights activist Pete Seeger in New York on July 20, 2014. (AP Photo/Kathy Willens ...

Yarrow had bladder cancer for the past four years ... memorial tribute concert for folk icon and civil rights activist Pete Seeger in New York on July 20, 2014. (AP Photo/Kathy Willens, File ...

AFP PHOTO (Photo by MANNY CENETA / AFP) Peter Yarrow, part of the US folk trio Peter, Paul and Mary that gained prominence in the 1960s counterculture movement, died at the age of 86 from bladder ...

Yarrow had bladder cancer for the past four years ... tribute concert for folk icon and civil rights activist Pete Seeger in New York on July 20, 2014. (AP Photo/Kathy Willens, File) Born ...