I was in a Catholic HS when everything changed. I was an altar boy too before and after the change. Mass was in Latin prior to the change. We went through a brief transistional Latin/English liturgy and then we went from singing Ave Verum Corpus to Bridge over Troubled Waters, Sons of God, They’ll Know We Are Christians by Our Love…
It has taken years and years to even come close to restoring the reverence that existed prior to VII. And, one of the questions I ask myself continuously is, is it the music or is it the reverence. Insofar as I can tell one follows the other. If you have a bunch of kids with guitars and drums, etc. a’strummin and a’swayin, chances are it’s not going to be particularly reverent. If the priest and congregation approach the Mass with reverence, well it really doesn’t matter the kind of music.
I sang in a cathedral choir for 18 yrs. Our worst liturgies were the ones with banner dancers, “maids” carrying bowls of incense, the insipid “Muppet” music for diocesan events.
We sang with guitars (played in a classical manner). We had bodhrans, tambourines, finger cymbals, etc. played - in context and in a classical manner. We’ve sung medieval concerts with shawm and crumhorn as well as singing Bach and Beethoven and Mozart.
What is the difference? Reverence. Mass is not some rock or folk concert. After VII when the music changed, it was assumed that all the then teenagers would just jump up and down and embrace the new liturgy. Guess again.