Tons of fun!!! One of my favorite places in the "world"!
There are 2 piano players at a time (they switch off every hour) and they will play just about any request you can throw at them. They are fantastic!! They also have a lot of fun songs that they do every so often that require audience participation like the Unicorn Song and the Hand Jive, stuff like that.
They encourage singing along, and we always leave so hoarse after an evening there. It's also quite loud and at times it can be smokey, but it's really a blast!