This is funny. Sad but funny. So you start by going to the "Cheerioke" web site and creating a look for your character. Then the site gives you a toll-free phone number: you call that number then sing along with your choice of three songs. Once you've finished, hang up the phone and turn your attention back to the web browser: the animated character that you made will sing the song back in your voice. You can save your song to the gallery for others to hear, and listen to others' horrific attempts at singing. It's great integration of the web and phone.
Try it at cheerioke.com.