Pentatonix | Ukrainian song Shchedryk - Carol of the Bells
"Shchedryk" (Ukrainian: Щедрик - щедрий вечiр, "Bountiful Evening") is a Ukrainian shchedrivka, or New Year's carol. It was arranged by composer and teacher Mykola Leontovych in 1916, and tells a story of a swallow flying into a household to sing of wealth that will come with the following spring.
"Shchedryk" was later adapted as an English Christmas carol, "Carol of the Bells", by Peter J. Wilhousky following a performance of the original song by Alexander Koshetz's Ukrainian National Chorus at Carnegie Hall on October 5, 1921. Wilhousky copyrighted and published his new lyrics (which were not based on the Ukrainian lyrics) in 1936, and the song became popular in the United States, where it became strongly associated with Christmas.