Other than being their first platinum-selling album, The Grand Illusion led Styx steadfastly into the domain of AOR rock. Built on the strengths of "Come Sail Away"'s ballad-to-rock metamorphosis, which gained them their second Top Ten hit, and on the high harmonies of newcomer Tommy Shaw throughout "Fooling Yourself," The Grand Illusion introduced Styx to the gates of commercial stardom…