Jellyrolls on the Boardwalk is a dueling piano bar. Lots of crazy fun. The piano men are great.
At Downtown Disney there is House of Blues and Raglan Road. Raglan Road has Irish music and Dance and a great bar, HOB has an entertainer that plays on the patio at the patio bar. Really a lot of fun.
Those are favorites. Other favorite things to do are catch a nice dinner in Epcot at Bistro or Le Celliar and watch Illuminations afterward. Enjoy slushies in France, head out on the monorail and visit the three deluxe hotels on the monorail crawl, have a drink at each and just look around. Catch the spectromagic parade and Wishes at MK. Relax at the pool at your resort and just soak in the atmosphere, maybe grab a drink at the pool bar. At DHS have a nice romantic dinner at Brown Derby and then catch Fantasmic.