I would play a Scriabin prelude so I could get to think of me as worthy enough to Bestow his knowledge upon me to carry out his Mysterium.
Surely that would require at least a Sonata.
I would do his 6th one, but I wouldn't want to scare him away.
If you want him to show you how to bring about the end of the world, it would probably help if you made him just a teensy bit nervous.