Absolutely gorgeous song! Hard to say if the best metal song because I'd want a long list for whichever mood I'm in. Sometimes you just want to crank some Cattle Decapitation and act like a spaz in your living room, other times you want to take psychedelics and wax philosophical to ambient black metal (didn't actually happen, just in case someone took me serious). That is one of the reasons I love metal is that it is so diverse but heavy on emotions (hate, anger, despair, voyeurism, mortality, spiritualism, etc).
JoshK on most other audio forums
Quantity only when quality is ensured.