What software do you use to automatically add lyrics to MP3 files?
I mean the kind of software that can scan your entire music library and do the job.
I want to add lyrics to my MP3 files so that when I'm listening to music on my iPhone I can see the lyrics on the screen.
Thank you very much for helping me (why not the entire internet?) to find the best software out there.
Edit: operating systems / media players I use: Mac OS X, Windows 7 / iTunes, Windows Media Player
Although I primarily use Mac OS X/Windows and iTunes/Windows Media Player, I don't want to limit this question to a specific operating system/Media Player. This way If you know any piece of software that does the job in whatever operating system/media player, please share your super user power in your answer.
I've written a post on my blog to showcase my findings regarding this question. Check it out: