Bone Music
I came across this fascinating article and podcast on the black market of illegal records made from used X-Rays in Soviet Russia. I highly recommend you have a read or listen.
"The records themselves were low-tech affairs, cut from their rectilinear forms into rough circles with scissors, then burned out in the center with a cigarette so they could be seated on turntables. Covert salesmen would sell them on the street, the “bone music” hidden within their trench coats."