If you want to self-host and store the files on a home server instead of your phone, you could try out Navidrome

Edit: I guess you specified that you know there are other solutions, sorry if this was unsolicited. I have a love for physical tech too so if that’s the reason you want an mp3 player, I get it. I’m collecting records myself :)

You can set it to use Wayland!

A r/LetGirlsHaveFun and an r/LetBoysBeManipulated 🥺