This interactive web art project has been used by over four million people around the world. It's called "Let Them Sing It For You". It consists of a free to use program that allows you to type in text and it will sing the words back to you using sound clips from famous songs. You can then send this by email to your friends, family, co-workers or who ever you please. It could be considered the singing telegram for modern times.
You can use this free program as many times as you want, there is no downloading or registration required. This must be on the list of top ten fun time wasters of all time.
Some words are not in the singing program vocabulary. Names in particular seem to be lacking. That aside, it's likely you will find this to be a very fun tool to use. And best of all, it's free.
See below in the resources section for the link to "Let Them Sing It For You".