That's so lovely. Who knows, maybe the fan piano player will be there again someday and you can tell him.

I had that surreal sensation of "Waaaait....no, it can't be!" once when I heard Eyes on Me (FFVIII) bring piped through a grocery store's sound system, but then it was a Japanese grocery chain.

Live FFX in a random setting is so much better. (Also...Hymn of the Fayth, heh. That's what I use for my alarm clock music.)