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In the Forum: Analog Playback
In the Thread: World's First Concrete Record.
Post Subject: World's First Concrete Record.Posted by xandcg on: 12/31/2015
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Yes, someone made it: http://www.nme.com/blogs/nme-blogs/this-german-guy-made-the-worlds-first-concrete-record-and-heres-what-it-sounds-like
There is a video.
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