I was searching for bone-conduction products and I came across this fascinating article about how banned western music in the Soviet Union was printed on repurposed X-Ray records -- http://www.thisiscolossal.com/2014/12/bone-music-xray-music/
Also, bone-conduction is really strange and interesting, there are a bunch of consumer products on the market that actually work -- https://en.wikipedia.org/wiki/Bone_conduction
@pfr my partner uses a hearing aid called a ponto that attaches to a titanium abutment screwed into her skull to tap into her conductive hearing ability.
@isaacs that's pretty amazing. I've found this on amazon and it seems to have some pretty good reviews -- https://goo.gl/RrkLIr The next step after getting a good pair of these is to test drive them by making an amazing playlist and taking them into some a sensory deprivation chamber / isolation tank
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