Great, free, simple little cross-platform app that seems to do its job. But I do wish the developer would provide a little more information about the job it's doing, either on a webpage, in documentation or in the app. I can confirm that the app relies upon (only) LyricWiki.org for processing lyrics (it says in the window that appears before processing). But I don't know, even after testing, what the app does with files that already have lyrics--does it replace the lyrics? Also, while it's clear what metadata the app pulls from files to retrieve lyrics, it's not clear how perfect a match the app requires to insert lyrics. This is pretty vital information.