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Wolfgang "Wolfie" Van Halen, the only child of rocker Eddie Van Halen and actress Valerie Bertinelli, was performing on stage at the time other aspiring rock stars were assembling their garage band.

NEW YORK, NY - DECEMBER 11: Ozzy Osbourne visits the SiriusXM Studios on December 11, 2014 in New York City. (Photo by Ilya S. Savenok/Getty Images) A lot has come out since Alex Van Halen did his ...