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."