Finally got to see this great exhibition with many of the original items from the book X-Ray Audio.

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In the USSR during the cold war era, the music people could listen to was ruthlessly controlled by the State. But a secret underground subculture of music lovers and bootleggers defied the censor. Incredibly, they built their own recording machines and used an extraordinary means of copying forbidden jazz, rock ‘n’ roll and banned Russian music to risk making their own records.

buero-doering.de/bone-music-english/

More Information:

www.youtube.com/watch?v=XMCCYnDvpJQ
mitpress.mit.edu/books/x-ray-audio
en.wikipedia.org/wiki/Ribs_(recordings)