Naturalist and sound recordist Dr. Bernie Krause first surfaced during the early '60s as Pete Seeger's replacement in the legendary folk group the Weavers; by the middle of the decade he was working as a staff producer at Elektra Records, in 1968 teaming with jazz musician Paul Beaver to record the LP The Nonesuch Guide to Electronic Music, a groundbreaking excursion into experimental sounds and textures which made innovative use of early synthesizers. The duo of Beaver & Krause went on to record a series of electronic records before the former suffered a fatal heart attack in...