I listed all my favorite tracks from each chapter, and then made a top 5 out of them. Personally, chapter 3 was musically the strongest of the four. There's so many great variations of the Tenna tracks, and all the creepy 8-bit content on the path to the mantle offers an excellent contrast. The other chapters all have something great to offer in their own way. Chapter 1 is lean on quantity, but has some of my favorite music period. Chapter 2 has Spamton and just a ton of fun tracks. Chapter 4 has a high ratio of heavy hitters, I'd argue it might be the second best musically. Though I'm sure if I ranked all these without sorting them into chapters, each chapter would have a top contender.