"The Incredible, Edible Egg" is a marketing slogan for the American Egg Board.
It was created in 1976 by the advertising agency Campbell Mithun.
In 2012, after over 20 years, a new version of the jingle aired on radio and television and a video of the jingle sung by the egg farmers and their families was uploaded to YouTube, Facebook and Xbox Live (via advertisements on the U.S. Xbox 360 Dashboard). It was promoted via a contest where Facebook users uploaded their own versions of the new jingle for the chance to win prizes, including an iPad, an iPod Touch 5G with a speaker system and $400 in iTunes Gift Cards, an iPhone 5, an Xbox 360 console with Kinect and a 12-month supply of eggs.
References
The Incredible, Edible Egg Wikipedia(Text) CC BY-SA