Here's what to know about "O Holy Night" Written by poet Placide Cappeau in 1847, "O Holy Night" is derived from Cappeau's poem Minuit, chrétiens, penned a few years earlier.

Hear the angel voice! Watch Billie Eilish perform 'O Holy Night' at final concert of the year The song was one of multiple holiday classics Eilish performed during her sold-out stint at the Kia Forum.