What is the fastest and most accurate way to add lyrics to mp3 files

I have read a tutorial online but I would need to add the "UNSYNCEDLYRICS" or something like that is there a easier way to add them with mp3tag.

Here is a list of web source scripts to search for lyrics:

Yet, I found it much more convenient to use Foobar2000 and the lyrics plug-ins as they search for all the selected files in 1 go.