Pete Seeger will celebrate his 90th birthday on May 3rd with a concert in Madison Square Garden. Bruce Springsteen, John Mellencamp, Dave Matthews, and many others will be performing at the concert celebration. And today we’ve begun our countdown to Seeger’s 90th with a virtual birthday party celebration on Facebook. Each week we’ll post new videoclips from the wonderful interview author Alec Wilkinson conducted with Seeger last month at Seeger’s cabin. You can post happy birthday wishes on our Facebook page and invite your friends to join the festivities as well. NOTE: Wilkinson’s book, The Protest Singer—An Intimate Portrait of Pete Seeger, will be available on April 21.