I didn’t RTFA, but I suspect the truth is more complicated than the summary. I was a child in the 60’s and didn’t pay attention to music back then. Somewhere in my 40’s I was like Whoa! Why wasn’t I paying attention to Pink Floyd and Led Zeppelin when it was on the radio??? I liked disco and still do. I liked New Age in the 80’s but now I’m like WTF was I thinking. Current music seems pretty good to me especially groups like Maroon 5 and OK Go. I even find my foot tapping to Katy Perry.
Different genres seem to have different peeks in different years to me. Funk was at its best in the 70s and 80s., Rap the late 80’s early 90’s. Blues and Jazz seems good in all eras. Hard Rock 60s and 70’s. Heavy Metal 80’s and 90’s. Techno from 90’s through today.
My dad on the other hand only liked Jazz and thought Rock was fad even in the 80’s and 90’s and opined several times that he thought its age was almost over (seems Rock has out lived my dad).