 Slovaks, Czechs and sometimes Belarusians sing kolyadkas not only on Saint Nicholas Day (which they celebrate on December 6), but on Saint Stephen Day (December 26) too.One of the most popular kolyadka (schedrivka) in the world is Ukrainian "Щедрик" (""Shchedryk""), known in English as "The Little Swallow".This carol has pre-Christian roots.