It's been 13 months since Paul McCartney toured the Motown Museum and offered to ship its historic but beat-up Steinway grand piano to New York for refurbishment. The job is done, and now comes word that McCartney and Motown founder Berry Gordy, Jr., will play the piano at a special fundraiser on September 18 in New York City. Wanna hear 'em? It'll cost you $10,000. The Insider has the skinny at  http://bit.ly/PSe6wD