I didn't see this until now - apparently when cosmonaut Yuri Malenchenko was married aboard the International Space Station (ISS) last August, the wedding march was played by his best man, fellow astronaut Edward Luon, on a PSR282 which is kept on the ISS.

Full story: http://www.yamahasynth.com/news/index.htm

I wonder if weighted keys would feel different from non-weighted keys in space...