I don't even listen to the radio anymore. ! Back in Florida I worked in this office and had a cubicle mate who always had her radio set to the same light and easy station, eight hours a day, five days a week. Not only did they endlessly rotate the same playlist, but they played the songs in the same order. Talk about maddening. This chick didn't mind though. Beige walls, fluorescent lighting, and the same crappy easy listening songs, in the same near exact order, 40 hours a week. Week in and week out. It was like being in hell. 
The same repetitious music serves a variety of purposes. Comfort and familiarity, for starters. And interestingly enough, the coworker in question grew up in a very unstable environment with a mom who was basically mentally ill, to where her basic needs weren't always being provided for. So there was my 20-something coworker, with her comforting pattern of repetitious music always going in the background providing something familiar and secure...and her McDonald's Happy Meal toys all lined up on her desk and on top of her computer monitor, watching Saturday morning cartoons, and so on. So sometimes "ritual rut" can provide a person with something secure, especially those who are psychologically wounded. Other times people aren't even consciously aware that they're listening to the same old music every day! Just a lack of alertness going on. The same thing that causes them to not notice certain things about this reality causes them to not even notice things about themselves and their immediate surroundings. Sometimes people seem to be stuck in a certain time period. If their heydey was the 70's, 80's, 90's, then they'll often be drawn to that music. Still others adapt an "old fogey" mindset, a concept related to the "heydey" idea. They think new music sucks and revel in the glory years of their own generation's music, resisting the change of time.
Admittedly, I don't listen to the radio and don't care for pretty much anything going on music-wise right now, so I'm one of those "rut" people you could say, bordering on the "old fogey" mindset. haha Recently though I came across new Depeche Mode and Green Day songs that I REALLY liked, and which jumped out at me. ("Precious" and "Boulevard of Broken Dreams," respectively.) But the only reason I even came to discover them was by sheer chance.....in somebody else's car who had their radio on!
So I know not all new music sucks. But....what's worth noting is that it seems the music industry itself is in a rut. There really isn't anything new going on in terms of music *style.* Using the aforementioned songs that I liked as an example: "Precious" sounds like Depeche Mode at it's early 90's best. New song, but using their same old familiar style. "Boulevard of Broken Dreams" to me has elements of Oasis in it. It's a relatively new song, but recycling an already used sound. So neither song is "new" or "innovative," bringing some previously unheard sound to the masses. It's just the same old, same old, rearranged in a different way.
Anyway, just some ideas.
"Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "Holy shit ... what a ride!" - Anonymous
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"I get by with a little help from my (higher density) friends."
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