One of the finest albums of their long career, Cornerstone is Styx"s watershed multi-platinum album from 1979 and continues continues Friday Music"s exclusive and much applauded Styx 180 Gram Audiophile Vinyl Series re-mastered impeccably from the original A & M Records tapes by Joe Reagoso at Friday Music studios with Kevin Gray. This limited edition masterpiece is housed in a beautiful first time gatefold cover.