If you're in the mood for a melody, as Billy Joel's well known hit suggests, a piano bar may be the place for you.  New York offers piano bars for every taste and mood. From the tuxedo clad waiters of the Bemelman Bar, to the time-warp speakeasy feel of Bill's Gay Nineties. Here's five of the coolest and most unique piano bars in town, so grab a cocktail and suggest your favorite tune.