"One" is a song written by Harry Nilsson and made famous by Three Dog Night whose cover in 1969 reached number 5 on the Billboard chart. The song is known for its opening line "One is the loneliest number that you'll ever do." It appeared initially on Aerial Ballet, Nilsson's third album.
The song was also covered by the rock band Filter for the soundtrack to the 1998 film The X-Files: Fight the Future.
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