Longtime friends with both Steven (a founding member of the Jukes) and Bruce Springsteen, Southside Johnny has released more than 30 albums in a career that stretches back to the early ‘70s. A Cleveland favorite, the guy has fond memories of the days when Kid Leo put him into the regular rotation on WMMS and always puts on a especially good show in Cleveland. He performs tonight at 8 at MGM Northfield Park — Center Stage.