This is Shostakovich in his more Bugs Bunny/Warner Bros cartoon mode. The Prelude sounds like a bizarre version of "We Wish You a Merry Christmas" (and at 1:31-1:33 sounds like "We Three Kings"!). The Fugue starting at 2:50 is so amazing.

She was with me even in my grave
When the last of my friends turned away,
And she sang like the first storm heaven gave.
Or as if flowers were having their say.

- Anna Akhmatova, "Music"(Dedicated to Dmitri Shostakovich)