James Fung, Ariel Garten, and Steve Mann (~2003) have created a wide variety of underwater biophone systems that use physiological signals to control different musical variables in an intricate way, as well as to actually generate sounds, including underwater ECG and EEG concerts.
The electrocardiophone is a quintephone in the sense that it creates sound from the "5th classical element" (i.e. from beyond the world of matter).
Related concepts 
The electrocardiophone is related to the electroencephalophone. In addition to sound-production, regenerative brainwave musical performances use brainwave interfaces to modify or manipulate or play along with sounds of other instruments in a live performance context.
Electroencephalophone as part of live performance. Using brainwaves the quintist directly interfaces to a music synthesizer, playing along with the other band members. A closed-loop system functions analogously with a regenerative receiver.
See also 
- "The Electrocardiophone: A New Instrument for Rapid Bedside Diagnosis of Cardiac Arrhythmias - GREEN 36 (6): 975 - Circulation". Circ.ahajournals.org. Retrieved 2008-11-27.
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