 Blue Bayou  is the title of a song written by Roy Orbison and Joe Melson, and originally sung by Orbison.It later became Linda Ronstadt 's signature song.on Henley of the Eagles sang backup on the recording. Blue Bayou was later certified Platinum (for over 2 million copies sold in the United States). It was a worldwide smash and was also popular in a Spanish-language version called Lago Azul.