It depends on what you are looking for but mpd works well if you have the music somewhere.

https://www.musicpd.org/

https://wiki.archlinux.org/title/Music_Player_Daemon

There are many client available. I think the relatively high number of clients shows you how decentralized it is.

I knew someone who had all his music on an iPod. Pretty convenient and decentralized but highly depending on iTunes, and I think SSDs are relatively cheap now, unless you save everything in flac.

tech

What's your preferred decentralized Music player?

It depends on what you are looking for but mpd works well if you have the music somewhere.
https://www.musicpd.org/
https://wiki.archlinux.org/title/Music_Player_Daemon

There are many client available. I think the relatively high number of clients shows you how decentralized it is.

I knew someone who had all his music on an iPod. Pretty convenient and decentralized but highly depending on iTunes, and I think SSDs are relatively cheap now, unless you save everything in flac.