This is one of my favorite spots to visit in the Epicenter. Each time I've been, I've never been able to get an actual seat inside, but the outer deck area is very nice. There's also plenty of room for dancing (if that's your thing).
I don't frequent dueling piano bars a lot, but the musicians at this one are pretty decent. Combine some of the strongest drinks at the Epicenter with fairly good music and you're looking at a really good night.
I recommend trying at least one of the fishbowl drinks that they offer.