There is a recording of Nils Frahm on a piano that is an ‘upright’ super grand piano that spans a couple of stories that I have which has no covers on any of the key mechanisms. You can hear all of the shuffling sounds of the force transfers from his fingers to the strings. In that regard it is a bit noisy and disconcerting. But on another hand it is quite beautiful sounding as the piano seems to have an almost ‘living and breathing’ sound. Years ago it was a free download. It’s two parts. The first is called “solo” and the second part is called “solo remains”. They are glorious recordings. I hope you can still get them somewhere. Supposedly they are fully improvised.

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