[Assistantpigkeeper]

Glenn Gould's recording of the Goldberg Variations is a must.

Missa Papae Marcelli by Palestrina There are lyrics, but it's in Latin, so I don't think it will be a problem.

Die Kunst der Fuge by Bach

The second movement of Sonata Opus 111 by Beethoven

2nd movement of Tempest sonata by Beethoven

And anything by David Lanz.