Lemme help with some links:
J. River Media Center current version
King Sparta's Lyrics Finder
Doof's Lyrics Editor
If you want to know what tracks do not yet have lyrics in the tag, there may be a "Smartlist" already there called "Task -- no lyrics" (or maybe I just built that one for myself so long ago I forgot
). To create a search for no lyrics put "Lyrics=[]" in any search bar - as part of a view scheme or smart list or just in the upper right standard search.
I usually use a special filter that excludes music that won't HAVE lyrics such as Classical, Ambient, most types of Jazz... stuff like that. That's a more complicated filter / search. The Lyrics Editor below adds another option beyond this: ability to look only for tracks that you have already "cleaned" with it.
Lyrics Finder works as a batch program, hitting many - though certainly not all - tracks. Play a bunch of tracks (or put them in "Play Now" then hit "stop"). Go to the Plugins section on the JRMC tree and choose Lyrics Finder. Go to the "Main" tab and do the "batch". It'll do them.
Lyrics Editor is more of a "per song" program, AFAICT, but will fill lyrics pretty quickly and will help "fix" them and clean up their formatting and such. Go to the Plugins section on the JRMC tree and choose Lyrics Editor. In the pull-down at the top choose to use what's in "Playing Now" or any other playlist or smartlist as your source of files. The files show up on the left (after a bit if it's a long list - I just had it find the 8000 of mine that do not have lyrics). Then use the various buttons to get lyrics or clean them or whatever.
When you're done, all the MP3s (or APEs, in my case) have the Lyrics added to the Lyrics field of the tags. Do with them as you see fit at that point - abandon JRMC if you like... whatever.
HTH!
I'm next going to try to figure out how to have the lyrics "pushed" from JRMC to a text file, then to an MLServer command to populate a variable with the current lyric (as stored and edited in the tags, not just "live" from EvilLyrics). Any help here would be appreciated, of course.