How to pull ID3 tags from online database(s) for specific albums?
the beets cli utility can query musicBrainz to get the id3 tags for your library.  Install beets from homebrew and run beets. Give beets a hint as to what you think the album is.

brew install beets
cd ~/elton/GBYBR
beets import Goodbye Yellowbrick


Choose [A]ccept [M]ore or A[B]ort when beets tells you what it's about to tag your files as.

source: https://media.readthedocs.org/pdf/beets/latest/beets.pdf

details: https://beets.readthedocs.io/en/latest/guides/tagger.html

If you would rather write the tags yourself I like 

id3tag 


link: Is there a good command-line ID3 tool for OS X?