Rock Band 3. Here's his account from USA Today:
"I've never allowed my music to be used in a game before," but an Entertainment Weekly review of NBC's The Office changed his mind. Alluding to an episode in which characters mention a Rock Band featuring Billy Joel, "the critic wrote something like, 'God forbid that ever should happen.' So I called my people and said, 'Get me (on) that Rock Band game.' Then I wrote the critic, saying that every time I get a check, I'll give him a little nod."We're assuming the songs will cost money, but we'd submit that reading the above story and knowing we'll never do anything remotely that cool is a dear enough price to pay.
Update: According to a release we just received from Harmonix, Joel's songs will start arriving on Dec. 14, including "Big Shot," "Captain Jack," "It's Still Rock N Roll to Me," "Movin' Out," "Only The Good Die Young," "Piano Man," "Pressure," "Say Goodbye to Hollywood," "The Entertainer," and "The Stranger"