Question: What song did the "Mother of Folk" say her grandmother would often sing on Twelfth Night?

<P0-S0> Jean Ritchie (December 8, 1922 – June 1, 2015) was an American folk music singer, songwriter, and Appalachian dulcimer player. <P0-S1>  Her career formed a kind of bridge between the traditional and modern forms of folk music: in her youth she learned folksongs in the traditional way (orally, from her family and members of her community); and in adulthood she became a successful modern folksinger, promulgating songs in public through concerts and recordings. <P0-S2>  She was called by some the "Mother of Folk". <SEP> <P1-S0> Twelfth Night is a festival in some branches of Christianity marking the coming of the Epiphany. <P1-S1>  Different traditions mark the date of Twelfth Night on either 5 January or 6 January; the Church of England, Mother Church of the Anglican Communion, celebrates Twelfth Night on the 5th and "refers to the night before Epiphany, the day when the nativity story tells us that the wise men visited the infant Jesus". <P1-S2>  In Western Church traditions, the Twelfth Night concludes the Twelve Days of Christmas; although, in others, the Twelfth Night can precede the Twelfth Day. <P1-S3>  Bruce Forbes writes:In 567 the Council of Tours proclaimed that the entire period between Christmas and Epiphany should be considered part of the celebration, creating what became known as the twelve days of Christmas, or what the English called Christmastide. <P1-S4>  On the last of the twelve days, called Twelfth Night, various cultures developed a wide range of additional special festivities. <P1-S5>  The variation extends even to the issue of how to count the days. <P1-S6>  If Christmas Day is the first of the twelve days, then Twelfth Night would be on January 5, the eve of Epiphany. <P1-S7>  If December 26, the day after Christmas, is the first day, then Twelfth Night falls on January 6, the evening of Epiphany itself. <SEP> <P2-S0> Alexander Yakovlevich Rosenbaum PAR (Russian: Александр Яковлевич Розенбаум , "Aleksandr Jakovlevič Rozyenbaum") (born September 13, 1951 in Leningrad, Soviet Union) is a Soviet and Russian bard from Saint Petersburg. <P2-S1>  He is best known as an interpreter of the blatnaya pesnya (criminal song) genre. <P2-S2>  Modern singers in this genre, such as Mikhail Shufutinsky often sing Rosenbaum's songs. <SEP> <P3-S0>  It appeared in Heber's widow's compilation of hymns entitled "Hymns Written and Adapted to the Weekly Service of the Church Year" in 1827. <P3-S1>  It can be sung to a number of tunes, including "Morning Star" by James P. Harding, "Epiphany" by Joseph Thrupp, and "Star in the East" by William Walker. <P3-S2> "Brightest and Best" (occasionally rendered by its first line, "Brightest and Best of the Sons of the Morning") is a Christian hymn written in 1811 by the Anglican bishop Reginald Heber to be sung at the feast of Epiphany. <P3-S3>  It appears in "The Lutheran Hymnal", and appeared in the 1966 Methodist hymnal. <P3-S4>  It has been recorded by a number of artists, including Glen Campbell, Joanne Hogg and Kathy Mattea (on her album "Good News"). <P3-S5>  The Kentucky traditional singer Jean Ritchie often sang this and told of her childhood memory of her grandmother sitting by the fire and singing it quietly to herself on Twelfth Night; the Library of Congress collected it from her in 1951.