Suite Madame Blue

"Suite Madame Blue" closes Equinox, written by DeYoung. It was not a single. It pairs with "Prelude 12", Curulewski's instrumental, which sometimes precedes it live. Songfacts quotes DeYoung, by way of Classic Rock Revisited, saying he wrote it in 1975 as America approached its two-hundredth anniversary, which was being taken over by commercialization, and that the fallibility of the United States struck him. A search summary of a 2014 Classic Rock interview has him calling it the first song he wrote about America, against Vietnam, Watergate and the oil embargo, with the metaphor of a once-beautiful lady who will not admit she has grown old; the page was truncated when read, so that quote is not verified, and the Songfacts quotes could not be found on the Classic Rock Revisited page it cites.

Songfacts says its structure was reused for "Queen of Spades" on Pieces of Eight. It is Curulewski's last album, and by timeline the guitar is his, though commenters dispute it. Setlist.fm counts 685 performances by Styx, and no covers were found.