When you listen to it year by year, it's harder not to notice. Even groups that were more upbeat took a negative turn there for awhile.

I totally stumbled on it though. Had way more time to listen to music during lockdown and was doing it year by year.

2011 - this is so fun, I love this music.
2013 - this is great, I'm having fun.
2017 - This is horrible, why is everyone suddenly so pissy....oooooohhhh. Got it.