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

Context paragraphs:
Twelfth Night XII: Twelfth Night is a studio album released by UK neo-progressive band Twelfth Night in 1986.  Although officially untitled, it is known informally as both "XII" and "The Virgin Album".  The number "XII" was printed vertically on the album cover with the words "Twelfth Night" inserted horizontally between the two "I's".  Some discographies quote the album's title as "X", apparently misinterpreting the "I's" as simply horizontal lines framing the band's name.

Twelfth Night (1933 film): Twelfth Night is a 1933 American Pre-Code short color film, notable as the very earliest surviving film directed by Orson Welles, then aged 17.  It is a recording of the dress rehearsal of Welles's own abridged production at his "alma mater", the Todd School for Boys, where he had returned to direct this adaptation of Shakespeare's "Twelfth Night" for the Chicago Drama Festival in 1933.  The play won first prize at that year's festival, presented as part of the 1933 Chicago World's Fair, A Century of Progress Exposition.

Jean Ritchie: Jean Ritchie (December 8, 1922 – June 1, 2015) was an American folk music singer, songwriter, and Appalachian dulcimer player.  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.  She was called by some the "Mother of Folk".

Tobias Beer: Tobias Beer (born 1976) is an English actor.  Born in Cambridge, he studied at Oxford University and the Webber Douglas Academy of Dramatic Art .  He has worked predominantly in the theatre, and his credits include: "Great Expectations", "Merry Wives of Windsor" (with Judi Dench, Simon Callow and Alistair McGowan), "Twelfth Night" and "The Comedy of Errors" (all for the Royal Shakespeare Company); "The Changeling" for Cheek by Jowl, directed by Declan Donnellan; "Cymbeline", "Twelfth Night", "Macbeth" and "A Midsummer Night's Dream" for the Open Air Theatre, Regent's Park In 2015 he will return to the RSC in Death of a Salesman.

Alexander Rosenbaum: 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.  He is best known as an interpreter of the blatnaya pesnya (criminal song) genre.  Modern singers in this genre, such as Mikhail Shufutinsky often sing Rosenbaum's songs.

Brightest and Best: "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.  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.  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.  It appears in "The Lutheran Hymnal", and appeared in the 1966 Methodist hymnal.  It has been recorded by a number of artists, including Glen Campbell, Joanne Hogg and Kathy Mattea (on her album "Good News").  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.

One-man band: A one-man band or one-woman band is a musician who plays a number of instruments simultaneously using their hands, feet, limbs, and various mechanical and/or electronic contraptions.  One person band musicians also often sing while they perform.  The simplest type of "one-person band" — a singer accompanying him/herself on acoustic guitar and playing a harmonica mounted in a metal "harp rack" below the mouth — is often used by buskers and folk music singer-guitarists.  More complicated setups may include wind instruments strapped around the neck, a large bass drum mounted on the musician's back with a beater which is connected to a foot pedal, cymbals strapped between the knees or triggered by a pedal mechanism, tambourines and maracas tied to the limbs, and a stringed instrument strapped over the shoulders (e.g., a banjo, ukulele or guitar).  Since the development of Musical Instrument Digital Interface (MIDI) in the 1980s, musicians have also incorporated chest-mounted MIDI drum pads, foot-mounted electronic drum triggers, and electronic pedal keyboards into their set-ups.  In the 2000s and 2010s, the availability of affordable digital looping pedals enables singer-musicians to record a riff or chord progression and then solo and/or sing over it.

The Henry Girls: The Henry Girls are an Irish folk and roots music group.  The band consists of three sisters: Karen, Lorna and Joleen McLaughlin.  All three have studied music and are multi-instrumentalist, utilizing fiddles, ukulele, banjo, guitar, harp, mandolin, piano, and accordion.  The Henry Girls often sing in harmony and their sound has been described as a mix of traditional Irish folk music and Americana.  They have contributed backup vocals to Mary Black's album "Stories from the Steeples".  They have also collaborated with Session Americana, Dónal Lunny, Moya Brennan, Jennifer Kimball, and The Fox Hunt.

Mountain Man (band): Mountain Man is an American singing trio of young women described as indie folk rock with a traditional Appalachian-type folk sound.  They are notable for earning critical acclaim from numerous music critics.  They often sing a cappella, with a "sparse, haunting, hymnal beauty" sometimes accompanied by soft acoustic guitar, but with their voices "virtually unadorned", according to "Guardian" critic Paul Lester.  The group toured with the vocalist Feist in 2011, and "New York Times" music reviewer Ben Ratliff described their performance as creating shifting harmonies which worked perfectly to complement Feist's vocal delivery.

Twelfth Night (holiday): Twelfth Night is a festival in some branches of Christianity marking the coming of the Epiphany.  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".  In Western Church traditions, the Twelfth Night concludes the Twelve Days of Christmas; although, in others, the Twelfth Night can precede the Twelfth Day.  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.  On the last of the twelve days, called Twelfth Night, various cultures developed a wide range of additional special festivities.  The variation extends even to the issue of how to count the days.  If Christmas Day is the first of the twelve days, then Twelfth Night would be on January 5, the eve of Epiphany.  If December 26, the day after Christmas, is the first day, then Twelfth Night falls on January 6, the evening of Epiphany itself.

Supporting paragraphs: Brightest and Best Jean Ritchie
Answer: Brightest and Best