"The closest the 'art establishment' ever came to embracing metal was punk. The reason they embraced punk was because it was rubbish and the reason they embraced rubbish was because they could control it. They could say: 'Oh yeah, we're punk so we can sneer at everybody. We can't play our fucking instruments, but that means we can make out that this whole thing is some enormous performance art.'"
I'll heed your advice on dungeons & dragons in song lyrics, but as for your take on music other than metal...I'll pass.