Tool, Nine Inch Nails/Trent (both are good, but I think waaaay too many people think they're the best thing "evar")
also Paramore, Jay-Z, Lady GaGa, AC/DC, SOAD, Linking park
And I won't put U2 here, because I'm actually a fan, but not the "they can do no wrong" kind but the kind that loves stuff they don't even play on their concerts anymore and I can totally see how people think they're overhyped.
Rolling stones and Beatles, Bob Dylan - I don't listen to them often, but I can see how they shaped modern music and a lot of their songs are genius.