Def Leppard’s Joe Elliot Surprises Detroit Fans, Joins Billy Joel Onstage at Comerica ParkDef Leppard’s Joe Elliot Surprises Detroit Fans, Joins Billy Joel Onstage at Comerica ParkIt was a great night for rock & roll in Detroit as Billy Joel welcomed Def Leppard's Joe Elliot to the stage of Comerica Park to sing 'Pour Some Sugar on Me.'George McIntyreGeorge McIntyre