[ybroze]

But yeah, the development of tonality kinda stopped in the 1850 range, with maybe Stravinsky, Tatum, and the 1940s Bebopers extending it as an exception. But at that point, tonality had passed out of the "art world" -- everything post-Duchamp's "Fountain" has been a bit more deconstructive and nihilistic.

Maybe of note, pun intended, Schoenberg was pursuing the "emancipation of the dissonances" while the Bolsheviks were destroying Russia. And of course, that's part of why nobody listens to Schoenberg or performs his stuff -- it's grating and kinda horrible, at least after he abandoned high Romanticism after Opus 5.

[ybroze]

Even then, though, Schoenberg was still following voice-leading principles usually. He'd just abandoned tonality and harmony.