Noted musicians celebrate the 90th birthday of legendary folk artist and political activist Pete Seeger.

Pete Seeger, legendary folk artist and pioneer of protest music, turned 90 in May 2009. Joining him for a concert event at Madison Square Garden to celebrate this milestone birthday are Joan Baez, Ani DiFranco, Arlo Guthrie, Ben Harper, Emmylou Harris, Richie Havens, Kris Kristofferson, Taj Mahal, Dave Matthews, Roger McGuinn, John Mellencamp, Peggy Seeger, Bruce Springsteen and many others who perform songs inspired by his music and activism.