7. Judas Priest
There's no ambiguity about whether or not Judas Priest are a metal band. The group formed in Birmingham, England right around the time that Black Sabbath began, but it took them a few more years to gain a big following. By the release of 1980's British Steel they were one of the biggest metal bands in the world, and they held onto that role until frontman Rob Halford left in 1992. They had some lean years with Tim "Ripper" Owens as the frontman, but they came back strong when Halford returned in 2003. The band are in the midst of a world tour, though founding member K.K. Downing recently left the fold.