One of my favorite places on "The Landing" is The Big Bang. My wife and I try to go thee once or twice each month. In fact, we have some nice acquaintances among the performers. This is an establishment that seeks to "rock the house." There is entertainment seven nights per week. Most weeknights the band plays at about 8:30pm-3:00am. However, on weekends opening times are 5pm with the piano players starting at 6:30pm.
On St. Patrick's Day my wife and I returned to this spot again to have an enjoyable evening. We we not disappointed. Two of our favorite performers were among the group that was playing on the dueling piano stage. The general format of the evening is for two performers to alternate playing requests. They trade off with two more performers each hour. There is a high degree of audience participation during the evening. In fact, when customers fail to participate, they are frequently singled out and the entire audience berates the person. Each hour, the wait staff performs one of several dance numbers along with the audience and everyone has a wonderful time.
On Monday, the crowd included those who had stopped in the area for a meal, people from Minnesota (in town for the NIT basketball game), a busload of St. Partrick's Day revellers, and many others. My wife and I stayed for about four hours, leaving only because we both had work the following morning. Reservations are not necessary, but you may have a large crowd waiting for a table. Be sure that you come to enjoy the Big Bang when you are in St. Louis.