the only way currently that i can think of is a manual edit in the tag editor.
That's pretty much what I suspected. And I'm not about to manually edit 20k+ tracks.
"I may be crazy, but I'm not stupid."
You can do it with Foobar, let me know if you are interested
Does it keep the external lyrics after converting to embedded? If so, please advise as I might be willing to undertake this. As this would be a one-time use of Foobar, I'd like to keep it simple. Also, is there a portable version available? I didn't see one on their site. Thanks.