I find it hard to declare one album as best of all time. I think you would have to break it down to the diffrent genres of music. Classic rock would have to be something out of the 70's 80's era, my vote would be early AC-DC, the Cult, Floyd, Foreigner. Metal would have to be Sabbath, Metallica(pre black album), Slayer, and Kreator. Southern rock would have to be skynard, hatchet, and 38 special.