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“I consider this possibly the hardest form of chamber music,” Kolesnikov said of the piano duet.

The piano duet has always been closely tethered to the home.

One was the grand, orchestral score most often performed today; the other, a piano duet.

During the Berlin concerts, he accompanied soprano Cecilia Bartoli on the piano, and in Vienna performed a piano duet with Martha Argerich, whom he has known since childhood.

When Michelle Obama was a virtual guest last week, she spoke warmly about the time she went to Ms. DeGeneres’s house and they played a piano duet together.