"Calling Occupants of Interplanetary Craft (The Recognized Anthem of World Contact Day)" is a song by Klaatu, originally released in 1976 on their first album.
The following year, The Carpenters covered the song, using a crew of 160 musicians. Both versions of the single had the entire name of the song on the label.
John Woloschuk, a member of Klaatu and one of the song's composers, has said:
The idea for this track was suggested by an actual event that is described in The Flying Saucer Reader, a book by Jay David published in 1967. In March 1953 an organization known as the "International Flying Saucer Bureau" sent a bulletin to all its members urging them to participate in an experiment termed "World Contact Day" whereby, at a predetermined date and time, they would attempt to collectively send out a telepathic message to visitors from outer space. The message began with the words..."Calling occupants of interplanetary craft!"
