Christmas Price Index chose the items in the popular Christmas carol "The Twelve Days of Christmas" as its market basket: a partridge in a pear tree, two turtle doves, three French hens, four calling birds, five gold(en) rings, six geese, seven swans, eight maids, nine dancing ladies, ten leaping lords, eleven pipers, and twelve drummers. According to tradition, the purchasing of the items begins on December 26 and ends on January 6. PNC compiles both a "Christmas Price Index" and "The True Cost of Christmas." The "Christmas Price Index" is calculated by adding the cost of the items in the song. The "True
Twelve Days of Christmas liturgically in the Episcopal Church in the US, having its own invitatory antiphon in the "Book of Common Prayer" for Matins. Christians who celebrate the Twelve Days may give gifts on each of them, with each of the Twelve Days representing a wish for a corresponding month of the new year. They may feast on traditional foods and otherwise celebrate the entire time through the morning of the Solemnity of Epiphany. Contemporary traditions include lighting a candle for each day, singing the verse of the corresponding day from the famous "The Twelve Days of Christmas", and lighting a yule log