The Twelve Days of Christmas (song)
"The Twelve Days of Christmas" is an English Christmas carol and nursery rhyme. A classic example of a cumulative song, the lyrics detail a series of increasingly numerous gifts given to the speaker by their "true love" on each of the twelve days of Christmas (the twelve days that make up the Christmas season, starting with Christmas Day).
Source: Wikipedia — The Twelve Days of Christmas (song) (CC BY-SA 4.0)