Back in 2000, jazz drummer Milford Graves received a Guggenheim grant and developed technology to record music based on the natural rhythms of the human heart. Graves then began experimenting with using various diagnostic tools to listen to volunteers' hearts and parsing the data with software. This process enabled him to zero in on the micro-rhythms within a single heartbeat. If the heart sounded abnormal, he would create a counter-rhythm to use in helping the heart return to a normal pattern.
Among those who worked with Grave was drummer Greg Fox. The recordings of Fox's heart were used to produce his latest alum titled “Mitral Transmission." The above sample track showcases Fox's biometric instrument.