Interesting ideas wrapped up in painfully obfuscated academic references (obviously not intended for this audience). THE FOURTH DEVELOPMENT [of new music], which is in many ways the most interesting, [is] namely the replacement of tones by sounds, and musical by acoustical hearing. Varèse, Pierre Schaeffer and their immediate successors awoke composers and audiences to the many new sounds, some of them produced elect…
FWIW, one of my beefs with classical music is the extreme lack of diversity in tones (ie: piano, violin, ...) as opposed to popular music (synthesizer) When you listen popular music on a timeline (70s, 80s, ...), you can at the same time see to the evolution of synthesizers and music production software.
I agree that synthesizers in pop music have been a welcome addition (70s & 80s produced some good music with it as you mentioned).