Harper's Encyclopedia of Mystical and Paranormal Experience. T his phenomenon is the recoding of apparent supernatural voices, some of which are audible, on magnetic tape.
Some voices claim to be spirits of the dead.
Other theories are that the voices come from extraterrestrials, impressions from the Akashic Records , or an unknown phenomenon of the subconscious mind. Still other psychical researchers believe the sounds are intercepted radio transmissions or static, or distorted mechanical noises. Raudive was inspired by the experimentation of Fredrich Jurgenson, Swedish opera singer, painter, and film producer. In 1959 Jurgenson tape recorded songs of birds in the Swedish countryside near his villa. At first, Jurgenson thought he had picked up a radio broadcast, and then thought it seemed strange that such an accident should be discussing bird songs.