This is the Waltz of the Flowers by Tchaikovsky. It's one of the most beautiful pieces of classical music written, and so superior to modern junk it isn't even funny. Now, my question is, why can't people write beautiful, peaceful, soothing, and just plain amazing music like this any more?
Why don't they write music like this any more?
Maybe this Chopin ditty will be more calming
Lol ditty? But seriously it's quite beautiful.

People can and write great music today. You can find masterpieces even in games (check Baldurs gate 2, Morrowind) But main thing is that classic music is kinda boring for musician or composer to make nowadays. You don't want to race with Tchaikovsky when there is so much to discover. I think you don't know modern music, from weather report to snarky puppy, progressive metal like arcturus to opeth and lots other, f.e. "from Gagarin point of view" track. P.S. please don't call mainstream music. You can't compare it to Tchaikovsky, you might compare it to drunken medieval singing in tavern.

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Emerson, Lake & Palmer were, and maybe still are, quite avant garde. They mostly played a progressive jazz/rock kind of stuff. The piece The Three Fates mostly features Keith Emerson, their keyboardist. I don't think he gets nearly the credit he deserves for the talent he had. Emerson was classically trained and I thought his work might appeal to the more classically minded crowd.
... Oh yeah, this piece is almost constantly changing. If you don't like what you hear, wait a few seconds. It'll probably change.
Of the four sides of their albums Works Volume I and Works Volume II each of the three put music one side. The fourth side was the band as a whole. Keith Emerson's side is much more traditional.
https://m.youtube.com/watch?v=QxHkLdQy5f0