It's not a question of availability. It's about the quality, creativity and originality of the music. The late 60s, 70s and 80s produced a stream of musical talent the likes of which we haven't seen since. Tech has played a part in that decline though the early pioneers of techno-pop, such as Gary Numan and John Foxx were genuinely creative. Ask yourself, if you think all this is merely relative, where is the David Bowie, the Bryan Ferry and the Elton John of this decade? That's just 3. I could list 100 more from those 3 decades who tower above anything coming out of the music industry today.

Those people either have very short memories or believe the hype. A lot of the stuff outside the top 40 is barely passable. Sheesh, even top 40 is full of trash, and that's picking the "best" 40 songs over a 10 year span.

The top 40 to me is a list of all the artists I should avoid.

Some music has an expiry date.

https://en.wikipedia.org/wiki/1999_(song)

http://www.lyricsfreak.com/p/prince/1999_20111205.html

Prince refused to perform it after it expired.