This seems spot on to me. It shows how some performers of popular music can be in an echo chamber. There are worlds beyond Rihanna, the Beatles, and Rascal Flats; there is more than I–V–vi–IV, 4/4, and verse-chorus; those other worlds have different barriers-to-entry than popular music.

In 2021, Coldplay released an album with a genuine prog rock song on it [1]; it was inspired by Dark Side of the Moon [2]. I have come across a few other bands who have pulled off something similar. I always enjoy it when this happens, because it shows that some musicians have wings bigger than the popular music world allows them to spread.

[1] <https://en.wikipedia.org/wiki/Coloratura_(song)>, <https://www.youtube.com/watch?v=kWUV5-frRU4>

[2] <https://www.youtube.com/playlist?list=PL3PhWT10BW3Urh8ZXXpuU...>