It turns out it is hard to play the piano well!
I didn't know because I simply spent every waking hour during my junior and senior years of high school teaching myself to play.
I always loved Wendy Carlos' performance of Two Part Invention in D (by Bach) on Switched-On Bach.
This is by far the hardest thing I ever taught myself.
Technically I know how to read music - actually doing it is very slow and painful. My only chance was to memorize this.
I can't play it anymore.
As I listen to this recording from c. 1986 I hear every hiccup. But a couple of days ago I listened to it in the car where I was quite a bit less critical and well, it's an achievement of some kind.