Van Halen might've been the "template" for the so-called *hair-metal* scene. I wasn't listening to a lot of metal back in the late 70s/early 80s but I remember seeing the that whole scene evolve. As far as the fashion and "look" of all these bands I'd say it was Van Halen that kicked it off. At least in the American, metal scene (the LA Sunset Strip sleaze scene especially) Van Halen definitley influenced hard/rock and metal. Without VH there'd probably not been a Motley Crue or Ratt. I really think VH kicked hard rock and metal in the ass. A once really great band.