Styx CORNERSTONE (LP)With CORNERSTONE, Styx entered the '80s primed to continue their run of phenomenal success. While it was one of their biggest selling albums, it also saw the beginning of a rift between the gritty rock tendencies of Tommy Shaw and James Young and the pure pop romanticism of Dennis DeYoung. The latter's ballad "Babe" hit Number One and gave the band even more popular appeal than before, but it stood in stark contrast to the less sugary offerings of