Released as the B-side to "Hi Hi Hi," McCartney explained that the song's title is said to be the opposite of the '60s expression "L-7," meaning "a square" or an unhip person. A C Moon forms a circle, which is said be cool. McCartney heard the expression in the song "Wooly Bully," where they sing, "Let's not be L-7, come and learn to dance."
The promotional video for this song featured members of the band in shirts with the letter C connected to a crescent moon drawing.
As "Hi Hi Hi" was banned in Britain, this got a lot of airplay resulting in a Top 5 placing in the UK singles chart.
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