Best Heavy Metal Band of all time. (Do people still listen to metal?)

AIC was probably the most metal leaning of the Seattle/grunge bands, but I just consider all of that to be alternative rock or whatever.. and different than "metal."

Tool may straddle that line about 50/50 though and they're great at that.
Oh yes, TOOL. "Progressive metal", isn't that what they call it? Whatever it is, at least a couple dozen songs or so of theirs are brilliant.