The staging, vamping, posing, black leather, head banging - it's all good cheesy fun. But I defy you to say this doesn't just rock out. Judas Priest, from a 1982 concert in Memphis, TN, with "The Hellion/Electric Eye":
By the way, I still think Rob Halford had (maybe he still has, I haven't heard him lately) one of the best set of pipes, not just in heavy metal, but in rock in general.