Went on a Tuesday evening to celebrate a birthday. Was much fun. Not too crowded.. There were just a couple of folks aside from us.
There are folks playing songs on the two pianos facing each other. They interact with the audience and try to get you involved in the act too. You can request songs and they'll play them especially if accompanied with a tip.
Such a fun time with the group! Lots of fun songs and singing along. Would go there again!
The only downside of the entire experience was that the kitchen closes at 10p (even though the place is open till 2a)