eyeD3 VS picard

I've used https://github.com/nicfit/eyeD3 for this kind of thing in the past

eyeD3 requires python, not sure if it would fit the suckless philosophy. But it's CLI.

Also, if you (or anyone) wants to see the original repo it can be found here: https://github.com/nicfit/eyeD3

Disclaimer: I don't think the eyeD3 library will break your mp3s when it's reading/writing ID3 tags, but it probably makes sense to work on a copy of your original mp3s, in case something goes amiss.

Have you tried https://www.funkwhale.audio/?

It can be used effectively as a "private spotify". Labeling is a solved problem thanks to https://picard.musicbrainz.org/, and the fact that a lot of the music you buy these days comes pre-labeled already.

You then have a web-app (and/or a mobile app, if that's your thing) where you can stream music as you would with Spotify.

You can even build yourself a little music-sharing commune with friends, where you all upload the albums you buy and accumulate a nice collection of diverse tunes.

I use picard for my collection. My work flow is Picard > Lyrics Finder > Foobar for BPM, RealGain and DR > Custom python script to pull genre and mood from Last.FM and spotify> then Advanced Renamer to perform naming clean up of folder names. I lowercase and underscore spaces. Also does files if I happen to need Mp3Tag when Picard doesn't find anything. Once this is done I move files on to may NAS.

Musicbrainz Picard - A great application that I've used in the past to identify and organize my saved music collection. It's not focused on adding semantic tags though: it's used for adding metadata to .mp3 files.

I do the same but run it though Picard[0] before adding to Plex.

[0]https://picard.musicbrainz.org/

feed all of your music to something like 'musicbrainz picard' - it will sort out all the tags and provide the artwork too

Aside from properly ripping and tagging your own physical collection I'd generally refer you to r/piracy but I think they've gone a bit strange since the blackout. I'm fairly sure anything more specific in that direction would not be appropriate for this subreddit.

Downloading MusicBrainz will be a lifesaver for you.