VIDEO: Mellencamp Jams With Billy Joel
In honor of John Mellencamp’s Birthday here’s the jam of ‘Authority Song’ he did with Billy Joel at Madison Square Garden.

John Mellencamp – 5’ 7”
Photo by Brad Barket/Getty ImagesIn honor of John Mellencamp's Birthday (10/7), we thought back to one of our favorite suprises from Billy Joel's shows at Madison Square Garden this year. He brought out Mellencamp for a rousing version of 'Authority Song'.
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