are you fucking kidding me lol
all of those artists are extremely well known by just about everyone, they're just garbage. Metallica's last good album was probably Kill Em All, ACDC has been garbage forever, Alice Cooper has been trying painfully hard to stay relevant since everyone stopped giving a shit about him, and motorhead's only song anyone gives a shit about was Ace of Spades. I don't know if your elitism of thinking i somehow have head my head in my ass all my life and did not know these artists comes from you being old and crabby or just a giant plebian, but either way it's hilarious. it'd be in your best interest to not ever go to /mu/. stay safe comrade.