"Calling Occupants of Interplanetary Craft" is a song by Canadian rock band Klaatu, originally released in 1976 on its first album 3:47 EST. The song was played to open night-time transmission of the pirate radio station Radio Caroline. The year following its release, American soft rock duo the Carpenters covered the song, using a crew of 160 musicians. The Carpenters' version reached the top 10 in the UK and Canada, and charted at number 1 in Ireland.