Live performance from the Derivative Duo at Northwest Folklife Festival in 2004, including tunes like "I Left My Heart in Sedro Wooley"
Bio: "The Derivative Duo, Barbara Glenn and Susan Nivert, are feminist comedienne opera singers who live in Seattle, Washington, and who have traveled across the United States for over the past twenty years, singing parodies of opera songs that queer, ironize, and feminize the themes and style of "high opera.""