Hair metal, mostly mid-eighties to early nineties. Motley Crue, Trixter, Winger, etc. I think it's better to skip the likes of Alice Cooper and Guns 'N Roses, who clearly did music at times that was not hair metal. This is not a call to attack the genre, which I'm fond of. The visual style, I don't know, but that's not part of musical merit. Evaluate on talent, melody, originality, etc.