Last week Billy Joel helped New York hedge funder Thomas Kempner Jr celebrate his 60th birthday but it wasn't cheap. According to sources, Kempner's wife, Kitty, paid Joel $2 million to perform an hour and a half. A party goer told the gossip columns, "It was a lovely party . . . some of Thomas' family members made touching speeches, then Billy Joel played with his band for a long time. But it was amusing to see all the billionaires dancing to Billy's 'Allentown' about the depressed manufacturing industry. Nobody there would know anything about working at a steel mine unless they owned one."