Modern music isn't as recognizable because there's way more of it, it's more varied, and doesn't get played a billion times over radio and MTV to a huge audience. The record industry isn't what it was at all, as detailed in your link. Jukeboxes with a selection of hits used to exist, now they're like spotify clients instead. I don't agree with you saying it's less enduring, though. That's a different thing. You shouldn't confuse popularity and number of plays for quality. For me there are some songs I'll hold on to a long time that I first heard in the last 10 years. There's still great music being made, IMO, but then pop from any era rarely was what I'd call good.