I admit that I've never heard Opeth before, but I'm not so sure, because my daughter was a fan of death metal some years ago (now she's 30 years old) and so she used to "teached" me something about it. I have to say that I was with her during some shows of death metal bands (italian, almost unknowed bands ^_^) and I liked to be there! I have to remember this content when we'll be in Krakow with my daughter ;)