I don't understand what you mean, changing the type of music I listen to. I never mentioned what type of music I listen to. I can't even do that because there is no way to describe all of it. Genres aren't applicable to my tastes. I couldn't pick just one (like "rock"...)
I have a very diverse music collection...

Flogging Molly is just one example. I don't even listen to them very often. Lol. You think that's all I listen to?
I haven't even tried Genius yet, but its not something I'm terribly excited about. Neat, yes. Amazing, not really. I'd have to try it on my family desktop which only has my sister's music on it (which is not all that interesting, considering she's 12...) I won't be able to fully appreciate this feature until I buy my own MacBook and personalize it with my own music collection...