One of the absolute best ways to find new music I think is movies. Some of the soundtracks are great. Best example the two Guardians of the Galaxy movies. I don’t think there’s a song on that soundtrack that goes into the 80’s, definitely not the 90’s. Another good indicator is that they chose music from all over and not just one genre. You can find songs you’ve never heard before or even appreciate some songs more in a newer context. It might even make you run out and buy the soundtrack thus gaining new music for your library and maybe help encourage filmmakers to put some thought into that soundtrack.