Well, that might be riskier, particularly if you don't have a grasp of what I like. But some people probably don't care, and that's cool, I like having them anyway.
The purpose of the mystery songs is to show people a particular side of my taste, to give a theme to the feel of each round, for me to recommend music, and to feel like I'm participating in my own roulette, particularly since I'm dozens of roulettes of participation behind a bunch of you. That's why I have a variety of types of rounds, some are more boxed-in intentionally, others are wide open.