For this broadcast of the Nothing Is Real Radio Hour, Sam Sebren brings listeners a selection of actual early home recordings, made before reel to reel or cassette tapes existed, on machines called "Recordios". Popularized by the Wilcox-Gay radio component company who introduced their version in 1939, Recordios were record cutting turntables (78rpm) with a built in AM radio and a microphone input which enabled people to cut their own records, either by recording music, speeches, etc from the radio, or by speaking, singing, etc into the microphone. People often sent or gave their recordings to friends and relatives in an early use of home recording as communication. Later in this program, Sebren, an avid recorder, collector, and maker of sounds, uses a hydrophone mic to record underwater sound waves from a variety of sources, including the Hudson river, which he then assembled into a new sound composition called "Hydrophonics", communicating a subliminal message to listeners about our vital source of life, covering 71% of the earth's surface - water.