Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Pyotr Nikolaevich Meshchaninov (Russian: Пётр Николаевич Мещани́нов, 9 July 1944 – 18 November 2006) was a Russian pianist and conductor specialized in Russian contemporary music. He premiered Sofia Gubaidulina's Concerto for bassoon and low strings [fr] in 1976, and her 1981 Descensio was dedicated to him.