Sprang up in LA (and at the same time Finland) in the early eighties as a backlash against punk, which many people believed was quickly selling out. The most famous hair metal band was (and still is) Motley Crue, who really kicked it all off. Influences of hair metal include Kiss, Aerosmith, Ted Nugent and many other hard rock acts of the 70's. Is actually completely different to 'poodle rock'
hair metal: Motley Crue, Hanoi Rocks, early Guns n'Roses
poodle rock: Poison, Europe, Warrant