If you're looking at this CD, then I'm picking you'll know Styx from their best selling peak in the 1970s, which is when I discovered them in my (long lost) teens. If not, then a brief summary is that Styx were HUGE in the USA, but struggled to make an impact abroad. Often compared to Journey and REO Speedwagon, they give you everything you expect in the "Pomp Rock" Genre. They seemed to specialise in the song which starts quietly, and then blasts your socks off (Renegade, Lady, Come Sail Away, etc). But a few outright ballads, and some outright rock songs too.
The playlist on the CD is sufficient to recommend it. I can't think of any hits that are missing, and at under  pounds it is excellent value. This is a great collection, and it took me back several decades to the '70s. Highly recommended.