I have to say Metallica, although I personally feel that ..And Justice for All was the beginning of the end. I was hella disappointed when they was trynna say that St. Anger was supposed to bring back memories of Kill em All; I don't recal hearing a single solo in the album. The production was horrible... etc.

However, the first 3, maybe 4 albums they had were straight classics in my opinion. Dave Mustaine's one hell of a musician, but I gotta go with Metallica on this one. Wish they'd make some kind of music instead of some kind of monster tho...