@thumbsup.eth
I can not recommend enough, that you run your music files through MusicBrainz Picard (https://picard.musicbrainz.org/)
It will make your Jellyfin, Plex, or other listening experience far better. You can even boost/normalize volume with the ReplayGain plugin.
But most importantly, this will ensure you have all the right genre tags, images, artist IDs, and your app can pick up the correct lyrics files.