https://www.npr.org/2024/04/17/ [login to see] /tiny-desk-concert-hauschka
It's hard to spot everything Hauschka deployed for this mostly improvised set, but after dismantling much of the piano's cabinet, he stuffed the strings with tin foil, a glob of pink putty, cellophane, piano tuner mutes, sleigh bells, gaffers tape and whatever else he could rummage from a large bag of toys he carries with him.