I could honestly say that if someone listened only to bands like Iron Maiden, Judas Priest, and Black Sabbath, than based on their knowledge they would be decently correct as those bands are heavily influenced by rock music.

However, when you progress into genres like death metal, thrash metal, black metal, even power metal, I hear no rock influences.

So basically Doom/Stoner/Sludge and Heavy metal are about the only ones related to rock at all, and even then it is all too separate from rock music.