Learned that you can edit music metadata from the commandline. On OSX, you can use the xattr command (xattr man pages). Here’s an example of how the command looks like:
xattr -l file.mp3
I wanted to change the cover art and couldn’t figure out what the metadata location was for mp3 files on mac. So I ended up using an application called Tagger
Update
There’s another command you can use, mdls, which will list all the file’s metadata (mdls man pages).