Pete Seeger, the inspirational American folk music icon, political activist and humanitarian, whose songs have helped to provide a musical backdrop for many of the historical movements of the past 50-plus years, marks a historic milestone himself on Sunday, May 3. Throughout the country and the world over, many special events are planned in celebration of Pete’s 90th birthday. In addition, a five-CD box set of Seeger songs has just been released, and a number of folk radio programs airing over the weekend are likely to focus on his life and legacy. [To read the entire article, including listings of more than a dozen "For Pete's Sake, Sing" events across the U.S., click on the headline.]