Richter never recorded the complete Shostakovich 24 Preludes and Fugues, Op. 87. You can hear him perform the Prelude and Fugue #6 at the link below. It comes from a CD that is currently out of print, so enjoy it while you can.
http://www.youtube.com/watch?v=7AR-A32mEZk

There is also a brief excerpt of him performing live the Fugue in D-flat (also from Opus 87) here:
http://www.youtube.com/watch?v=o30hSCYEw_E

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.


- from the poem entitled "Music" (Dedicated to Dmitri Shostakovich) by Anna Akhmatova and translated by Lyn Coffin.
_________________________
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)