I would say I am a jack-of-all-genres in terms of knowledge of bands - I would say my strongest knowledge is back in the good 'ol days of Metal, mid-late 80s.
This is actually an interesting question, in that, we should have a thread (ugh I hate to say it, but one of those game threads that I hate) where someone asks a trivia/stumper question, and see how many answers that person's question can generate, or what knowledge people can offer based on the question.
The only problem being, there would be no googling allowed, but I don't know that everyone would follow the honor system...