On Friday, acclaimed folksters Joe Jencks and Maria Dunn will present "In the Spirit of Pete," a show dedicated to American folk hero and activist Pete Seeger, on what would have been his 100th birthday. Seeger met Woody Guthrie at a benefit for migrant workers, and soon after the two helped form The Almanac Singers, which at different times had artists like Sonny Terry, Brownie McGhee, Lead Belly, Josh White, Burl Ives, and Richard Dyer-Bennett in its ranks. Pete Seeger worked to make the world a better place, with his political and environmental activism, community-building, and of course, his music. He was always encouraging people to sing together. He certainly overcame.