Windows/Mac/Linux: Free application AutoLyrix automatically fetches and displays album artwork and lyrics for the currently playing track in your music player of choice. AutoLyrix is an open-source alternative to previously mentioned EvilLyrics, and like EvilLyrics, it not only downloads lyrics but also advances lyrics karaoke-style with the music when possible. AutoLyrix could use some polish to the interface (though it does transparency and has a few other options), but functionally it's been working really well. The app works with virtually every popular media player, including iTunes, Winamp, Windows Media Player, foobar2000, Last.fm, MediaMonkey, and more. AutoLyrix is a free download for all platforms, requires .NET 2.0 on Windows and Mono on OS X and Linux.