We celebrate Earth Day with renowned natural sound recordist Bernie Krause. He talks about his early career in professional music and how he made the transition to naturalist and bio-acoustitian. Krause will take us on a sonic tour to some of his favorite wilderness areas.  He talks about his new book "The Great Animal Orchestra: Finding the Origins of Music in the World's Wild Places."  This Sunday 4/21 7 am and on Monday 4/22 9 pm