... that "Pop Goes the Weasel" was originally a darkly humorous vignette of the cycle of poverty among workers in the East End of London?
... that Ashlee Simpson's single "Invisible" is a cover of a song by non-commercial rock band Jaded Era, which became famous thanks to Simpson's cover?
... that K-Pop, an abbreviation of Korean Pop, generally refers to the popular music of South Korea, as North Korea has no popular music industry?