What metadata provider(s) does Symfonium use?

Feature description:

I originally used a combination of local files with an external sync application but switched to jellyfin to save space on my phone. While I was using local files I liked how the metadata showed up-to-date images, even one from spotify that was updated by the artist just yesterday. I want to use the same metadata provider in my jellyfin server, so I would appreciate it if you would let me know. If it is something you cannot share I understand that.

Problem solved:

Jellyfin’s only image provider has horrendous images

Brought benefits:

anyone else who needs a better image provider

Other application solutions:

 
finding alternate jellyfin plugins
 

Additional description and context:

 

 

Screenshots / Mockup:

    

Deezer and last.fm but no idea how to add that to Jellyfin