"Calling Occupants of Interplanetary Craft" is a song by Klaatu, originally released in 1976 on their first album 3:47 EST. The song would open night transmission of pirate radio station Radio Caroline. The year following its release, 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 (the picture sleeve of the Carpenters' single had the subtitle in small print); re-issued singles of the Klaatu version had the title shortened to "Calling Occupants".
The Carpenters' version from their Passage album charted worldwide and appeared on several of their hits compilations. The song title appears on the Carpenters' version above the tagline "(The Recognized Anthem Of World Contact Day)". The success of their version led to the duo receiving many letters from people asking when World Contact Day would be held. The song ultimately led to a successful Carpenters television special, The Carpenters...Space Encounters.
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