I was listening to bass-baritone Jarosław Bręk on a recording of one of Penderecki's choral works and I liked his voice so much that I went searching for more of his singing. Unfortunately, I learned that he passed away last year at the age of 46. His voice is very beautiful and expressive.
I love the piano part in this piece: https://www.youtube.com/watch?v=xzAIpWYpbhE