Happy 90th birthday, Pete Seeger

American folk singer Pete Seeger turns 90 years old today. But he hasn't just sung the old folk songs, he's written songs that speak to the issues of the times -- like If I had a Hammer, and Where have all the Flowers Gone? and Turn! Turn! Turn! He was instrumental in the folk music revival of the 50's and 60's. In 1964, his version of Malvina Reynold's song, Little Boxes, made number one on the Billboard charts. Many of the songs he wrote were chart hits for other performers. Pete Seeger recognized that music is a powerful tool -- some might say, weapon -- and he used it in the fight for social justice. He normally performs with a banjo, helping to keep that traditional American instrument alive, too. Thanks, and Happy birthday, Pete.

To celebrate Pete's 90th birthday, watch Little Boxes or the many other video clips of Pete Seeger's performances made throughout his career.