Interesting... I was just thinking about this last night. All of this change has happened so gradually, I think I'm just beginning to realize how different things have become. Along with that, almost all of my radio listening over the past couple of decades has involved those "left side of the dial" FM stations (and we're lucky to have many of them around here). Anyway, it occurred to me last night that there's no longer a station (AM or FM) where I can even find the Beatles anymore. The pop stations have either converted to talk radio or to hispanic ownership/programming, and even "classic rock" is hard to come by! That is, it's even hard to find a station playing "stairway to heaven" and "free bird", let alone anything that pre-dates those.
It's great to have access to a number of college and listener-supported FM stations, and just about anything you'd care to hear is available at one time or another, but it comes down to rememebring to stay up until midnight on the third Thursday of every other month in order to catch a full program of whatever it is you want to hear.
A few months ago I tried sampling a few of the internet stations available through iTunes, but the issues of selection and repetition (as mentioned above) were discouraging.