Host Bob Edwards talks to Bernie Krause about the sounds he's recorded in natural habitats around the world over the last 30 years. Krause talks about "biophony," a term he defines as "the combined sound that whole groups of living organisms produce in any given environment." (8:34) [Krause's autobiography, Into a Wild Sanctuary: A Life in Music and Natural Sound , is published by heyday books. His cd's are available this week on the Mirimar label.] Due to Internet rights issues, this segment has been modified from its original broadcast form.