@GeoffWozniak id3tag is pretty much my go-to for command line, if I have to do mp3. (My recently-completed re-ripping project was to get everything in FLAC, and metaflac does almost everything I've asked of it.)
@me I am converting flac to mp3 for my wife's iPhone. flac2all is working alright, and I use mid3v2 to adjust/correct the tags.
id3tags isn't even in Ubuntu's package system, which is surprising. Maybe under some non-obvious name...
A bunch of technomancers in the fediverse. Keep it fairly clean please. This arcology is for all who wash up upon it's digital shore.