Billy Joel (:
Frederic Chopin, Liberace, Randy Newman
Lady Gaga, she plays the piano sometimes at her shows :p
The first ones that came to my mind were Elton John and Billy Joel. But I have to admit, I miss the outrageous outfits Elton John used to wear.
See you get 2 for the price of one.
Claude Debussy. He's pretty much my favourite composer.
Mozart and Beethoven