I think I understand your point . . .
Well, classical music has deviated considerably from today's popular music. At times in the past, SOME classical music COULD actually BE the popular music of the particular culture. This, for instance, can be true of opera.
No doubt Strauss waltzes were popular, and probably were danced to. Examples could go on. Even music we think of today as very highbrow was often heard by average persons, since Tocattas and Fugues were played in an ecclesiastical (church) setting. Even today, at the cathedral we attend, these types of classical pieces are played on the organ as a preludium before the service, and again -- a different piece -- as a postludium after the service.
I just suggested instances where classical and popular music were much closer. For another instance, the popular music of the common people -- folk songs of the country people -- became a prime "mine" for melodies and inspiration for certain composers. Most melodies that Ralph Vaughan-Williams used in his classical work comes from the folk music -- some hundreds of years earlier.
Today popular and classical seem far apart. Perhaps something is happening such as has happened to poetry. It has sort of been taken over by University literature professors. It has become pretty rarified, and sometimes you almost have to have a doctorate in comparative literature to even understand it (e.g., T.S. Eliot).
The highbrow music establishment perhaps has staked out what we call "classical" music as a kind of preserve.
There was a post a few weeks ago where a student was rather hurt that her teacher was so "bitchy" after she played a popular piece. She had herself found this piece, learned it, and hoped to be praised. Another subscriber replied, "perhaps the teacher was very vexed that you dared to play other than classical, and thought that perhaps it was beneath him to even assist you with it." (Paraphrase)
Well, here's my EFFORT to reply. Hope I am not too far off the mark --