Eh, re:entertaining and such, people (even older people) tend to forget that older generations of music were also filled with their fair share of bands and acts in it just to make a quick buck. We tend to filter them out over time and only ever remember the greats. Everyone remembers the Rolling Stones for example, but how many people today remember The Monkees? They were one of the (many) bands that were just making a buck, just like how (to take an example I've mentioned in detail here before) Nickelback was when I was growing up as a kid, or hell Puddle of Mudd (even though I absolutely still blast Burry today).
Nevermind music back then, as it does now, also was sending some kind of message, albeit exactly what changes depending on the then-current trends/issues/blah. Beatniks of the 1950s, hippies from the 60s/70s, punk/ska/etc from the 90s/00s, etc.
--------------
Anyway, ironically enough a song that's been stuck in my head these last few weeks is exactly that: some artist expressing the history of a certain musical vocal program (Machine Love by JamieP):