Cocktails and Twin Blondes playing dueling playing pianos, how can you go wrong? This place is great cheap entertainment. Your only expense is drinks ($6 for a beer) and a tip for a song request. There's usually a happy rambunctious crowd packed in the bar and plenty of antics instigated by the twins.
Be careful what you write on your requests or you'll get called on stage for some piano high jinx. To get a seat, show up earlier than the 9pm start time. Also, Harrah's is a stop off of the monorail, so there's easy access. And, it's within close walking distance to Jimmy Buffett's Margaritaville if you're a Parrot Head.
Tips - If you want to see the twins, they generally work ONLY Tuesday through Saturday. On the other nights, guys from the Las Vegas piano bar circuit fill in (like Al Robinson & Shaun DeGraff) . Also, you need to pay to get your songs played. The more you pay, the sooner the song gets played.