Hank Williams sounds old? Well, I guess it did to me once, but not now. I agree that most pop music is "of it's time", though. And that the late 50's stuff playing right now on my stereo certainly doesn't seem as dated as even grunge rock. I wonder if a lot of this is due to our own internal memory system though. I haven't listened to grunge rock, to use the example, on a regular basis since the mid nineties, so if I hear Nirvana or Alice in Chains, my brain automatically thinks "ah. nineties. yes, I remember then..." Where as I've discovered jazz from the hard bop era at various times, so my brain can't spot the period. For instance, I was listening to Blakey a lot earlier than I was listening to Donald Byrd, so my brain can't compress Freedom Riders and Byrd in Hand down to the same period. I don't know; just puzzling "out loud" here, if you know what I mean...