That was probably me. (Not a dude here but everyone seems to call me that.)
I don't know any other videos etc that would cater to your interests (and neither do I think it's cool) but Stephen Hough does a lot of writing on various issues for press and for himself. He's a brilliant and witty writer, great guy to chat with and obviously a brilliant pianist. Maybe he'll have some writings on backstage nerves. I can't find any at present as his writing is littered all over the internet and not just his website; I've also tried looking for an old article he wrote about how he demands above all a clean piano keyboard and brings a cloth with him onstage to scrub at the keys between movements. I can't find that either.
And yes, he's gay and Catholic. Homophobes go away.