For years, I have been telling people that The Carpenters' song "Calling Occupants of Interplanetary Craft" was broadcast out into space on World Contact Day. Well, according to Wikipedia (*see explanation of Wikipedia below), it is actually just a cover of a song written about the first World Contact Day (originally written by Klaatu and called "The Recognized Anthem for World Contact Day" in the hopes that if there was a second World Contact Day, the song would be the natural choice for the anthem). This is my formal apology to any that I have misinformed.
Hopefully this music video can make amends.
The Carpenters - "Calling Occupants of Interplanetary Craft"
Explanation of Wikipedia (by Michael Scott)