FOSS Automated Music ID3 tagger?

This lovely community helped me find a few great FOSS options to deduplicate my out of control photo library, so thanks to all!

Now I'm wondering if anyone knows of an app that can scan a library full of digital music and auto assign (or auto correct) ID3 tags. Similar thing with the photo dilemma. I'd rip my collection to FLAC or MP3 and do a half-assed job naming and categorizing the files because I got lazy. So now my music collection has a bunch of albums listed erroneously as "various artists" for example.

Also, if you're digitizing stuff now, please don't be a moron like me and take the time to organize as you go. Good grief what a mess. Thankfully I've learned that lesson as I digitize old 35mm slides for my parents to save!