I have noticed that most of my favorite Rocks bands are British and its likely due to the classical influence that makes many of them interesting to me. That is not to say that American roots music and what followed sucks because nothing could be further from the truth. Overall I prefer the way British rock bands utilized movements, space and the compositions have enough substance that even after listening for decades I am still finding interesting things in their music .
As for pop music today, its rare to hear more than two real instruments being played on top 40 songs any longer. There is interesting new stuff out there but you are pretty much on your own finding it because the music execs and radio stations are not going to help you find it or promote it like days gone by. And good luck finding a record label that will let a new band spend the time needed in the studio to record complex pieces. They prefer the geek with a computer full of samples, its increases the oligarchs profits.
I remember listening to BS&T and Chicago for the first time in the later '60s. I recognized classical influences immediately.
