This week back in 1978 was a good one for Styx.
Their current album at that time peaked at number 6 on the U.S. Charts, and became Platinum, selling over 3 million copies.

The LP was released in June of 1977, and featured a few hits including 'Fooling Yourself', 'Come Sail Away', 'Miss America' and 'The Grand Illusion.'
Check out this video from one of Styx 1978 concerts.