I guess the OP meant the best decade in recent Western pop music, so I'm partly trolling here. Unfortunately many people think this is the whole history of music. I love all kind of music, including some "modern" music but Baroque music for instance is one of the most beautiful music I've ever heard. Of course, here I mean "European" music, so this is biased too. If you're into other kind of music, let's say classical Indian music, I'm pretty sure there was a best decade too.

But to your point, it's interesting how the fiat system has affected music quality, so most of pop music today is totally garbage, just like our money...