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but the piece that truly brought him to international attention was Threnody to the Victims of Hiroshima (see threnody and atomic bombing of Hiroshima), written in 1960 for 52 string instruments. In it, he makes use of extended instrumental techniques (for example, playing behind the bridge, bowing on the tailpiece).
He’s playing Penderecki
TIL. Thank you!
https://en.wikipedia.org/wiki/Krzysztof_Penderecki
The Threnody is definitely his most famous, but he has used that technique in some of his solo compositions for cello as well - example
Threnody to the Victims of Health Insurance Companies.