For those who like covers:
Stone Sour's Record Store Day release features covers from Black Sabbath, Judas Priest, Alice In Chains and Kiss. Check out all the tracks on Youtube for free.
Many Metallica fans were surprised by the sonic overhaul the band gave itself for 1991's self-titled Black Album, but according to the record's producer, Bob Rock, in some ways, the end result only hinted at some surprising influences.
The Metallica guitarist once claimed to have 400 riffs to sift through for the band's next album, but he no longer has access to a whole bunch of them.