Thank you, however it doesn't work!
Your procedure is what I tried this morning.
If I click on that symbol I open the "freedb ID" window, which is the one that I normally use to download tags.
This window has four options: "determine from inserted audio CD", "determine from selected files", "enter", "determine via web search".
Let's say that I start the web search option. I have a list of results "genre / artist / Album" to chose. However, none of them has lyrics included.
If I click a small arrow next to the symbol you posted, I have a list of scripts (is this what it is meant a script??) called Amazon.com, Amazon.de, Music Brainz, Discogs.
Should I have the 5 scripts I downloaded in this list and run one of them? If yes, it means that this is the problem and that just copy and paste them into "data/sources" didn't work...