While I technically don't count as the entertainment, I sailed on the Elation in Sept of 2007 and Damian Brell was nice enough to let me sit in and play on two different nights (2nd night, and 4th night). He had a laptop with all his songs in front of him, but I just played some standards and some sing alongs (Billy Joel, Journey, etc).
I had just got finished doing a few shows in LA (I play guitar for various pop artists) and I was on the cruise by myself - so it was really nice to be albe to sit down at a piano and goof off a bit. It was one of the more special moments of my first cruise.
~ Joey ~