Miles and Tim Robbins perform during a concert for folk music legend Pete Seeger at Madison Square Garden in New York on May 3, 2009 marking his 90th birthday. Proceeds from the show will go to Hudson River Sloop Clearwater, an organization founded by the singer 40 years ago to preserve and protect the Hudson River. Getty Images logo Getty Images 7 months ago

Miles and Tim Robbins perform during a concert for folk music legend Pete Seeger at Madison Square Garden in New York on May 3, 2009 marking his 90th birthday. Proceeds from the show will go to Hudson River Sloop Clearwater, an organization founded by the singer 40 years ago to preserve and protect the Hudson River.