My husband and I had a blast here on a Wednesday night. The performers were great! They really know their music. As others have written, yes, they will play requests of those who tip higher. If you're there early in the night you can get away with a $5-$10 tip for your song to be played. As the night went on it seemed you needed to tip at least $20 to have your song played. We personally did not request any songs but enjoyed what others had requested.
The drinks were expensive, but it includes a free show of great performance and humor. I would highly recommend visiting Napoleon's Piano bar. Get there around 8:30/8:45 or you might not get a table. Once the music started around 9, people were lining up to get in. We sat at the bar and had a great view of the place and performers. Great time in a comfortable environment!