Music should not be centralized.

Cool, feel free to create a website that does as much as lists track names and let me know how long will you survive before your hosting provider gets flooded with bullshit DMCA notices and shuts you down.

I'm not talking about downloading music, I'm not even talking about some custom player for reproducing music, I'm talking about just putting say a list of songs from a playlist as plain text online.

It's centralized because there's a few big labels that own a lot...but otherwise it's such a commodity that you can go to any streaming service and you more or less have the same catalog.