I agree with some of the OP's statements, since during the three decades mentioned there was a revolution with rock and blues and reggae etc. but
mostly in the English-speaking world.
You could say it was a time when music with serious lyrics was vastly popular - and you cannot say that about today's English-speaking world. That
spiritual and political change chose English as its main language - all over the world people started to listen to rock groups.
You had classical music, folk, ethnic recordings, gospel and dance light music before, but most dance or light music had insignificant lyrics, or
following fashions. That was still true of the first rock and roll hits, however, protest songs and other content was clearly coming in by the 60's.
Now the whole thing looks different if you understand French, Greek, Spanish, Russian or Arabic - there you had some urban songs, chansons, adapted
folk tunes with more serious themes, as well as thematic music (like revolutionary songs). But from those decades rock (including Dylan etc.) changed
that too. Moreover, hippies did not even dance to some of the most interesting stuff - Dylan for example. I mean it was not like mambo or swing. I am
not saying that was not good music - I think Ella Fitzgerald can be judged as better musically than a lot of later popular music - but one thing is
true, you had very popular music with sometimes playful, but sometimes very serious lyrics from the golden age of rock onwards.
However, at the time radio and club music did not always reflect what was good quality and interesting. In some non-English countries, such as Eastern
Europe, listening to the Beatles or the Stones was considered a rebel bahavior and certainly it was not supported by the radio stations... Yet in
other places such as France they always had their musical world, continually, but it changed with the advent of rock (etc.) which arrived in
English.
I think even Persian and Arab music changed a little in response to Western popular rhythms.
I also agree that there are fewer interesting lyrics these days in English if you compare numbers and sales and TV. However, there still are some -
and tastes differ as far as the musical basis - just the lyrics alone would not make someone listen... Some prefer reggae, some metal, some prefer
native tongues such as Russian or Spanish.
Here is a 21st century song that was meaningful lyrics in English and popular from Faithless:
www.youtube.com...
IMO Lady Gaga has some depth to her music - not only light entertainment, however, as careful analysts of her music videos point out, her messages
(including her "video rhymes") can be quite disturbing and very manipulative.
I'd rather let my kid listen to death metal (at least that is kinda open).
Then again, Jim Morrison wasn't an easy listening trip either...