Question: What song recorded during the "Let It Be" sessions did Martin Luther McCoy sing in "Across the Universe"?

Context paragraphs:
Don't Let Me Down (Beatles song): "Don't Let Me Down" is a song by the Beatles (with Billy Preston), recorded in 1969 during the "Let It Be" sessions.  It was written by John Lennon and credited to Lennon–McCartney.

Alain LeRoy Locke: Alain Leroy Locke (September 13, 1885 – June 9, 1954) was an American writer, philosopher, educator, and patron of the arts.  Distinguished as the first African-American Rhodes Scholar in 1907, Locke was the philosophical architect —the acknowledged "Dean"— of the Harlem Renaissance.  As a result, popular listings of influential African Americans have repeatedly included him.  On March 19, 1968, the Rev. Dr. Martin Luther King, Jr. proclaimed: "We're going to let our children know that the only philosophers that lived were not Plato and Aristotle, but W. E. B. Du Bois and Alain Locke came through the universe."

Mit Fried und Freud ich fahr dahin: "Mit Fried und Freud ich fahr dahin " (In peace and joy I now depart) is a hymn by Martin Luther, a paraphrase in German of the Nunc dimittis , the canticle of Simeon.  Luther wrote the text and melody in 1524 and it was first published in the same year.  Originally a song for Purification, it has been used for funerals.  Luther included it in 1542 in "Christliche Geseng ... zum Begrebniss " (Christian chants ... for funeral).

Across the Universe (film): Across the Universe is a 2007 British-American jukebox musical romantic drama film directed by Julie Taymor, centered on songs by the English rock band the Beatles.  The script is based on an original story credited to Taymor, Dick Clement, and Ian La Frenais.  It incorporates 34 compositions originally written by members of the Beatles.  The film stars Jim Sturgess, Evan Rachel Wood, Joe Anderson and T.V. Carpio, and introduces Dana Fuchs and Martin Luther McCoy as actors.  Cameo appearances are made by Bono, Eddie Izzard, Joe Cocker, and Salma Hayek, among others.

Of Thee I Sing (book): Of Thee I Sing: A Letter to My Daughters is a children's book by former United States President Barack Obama, with illustrations by Loren Long.  It is described by the publisher as "a moving tribute to thirteen groundbreaking Americans and the ideals that have shaped our nation."  The stories of thirteen Americans are told in the book: George Washington, Abraham Lincoln, Martin Luther King, Neil Armstrong, Sitting Bull, Cesar Chavez, Billie Holiday, Maya Lin, Albert Einstein (who was born in Germany), Georgia O'Keeffe, Jackie Robinson, Helen Keller, and Jane Addams."

Martin Luther McCoy: Martin Luther McCoy (born July 1970) is an American musician and actor.  The San Francisco native collaborated extensively with musicians like The Roots and Cody ChesnuTT and appears as one of the six lead characters in the 2007 Beatles musical "Across the Universe" in the role of "Jo-Jo", who reflects Jimi Hendrix.  In the film, McCoy performs the song "While My Guitar Gently Weeps", and "Don't Let Me Down" and also provides guitar and vocals on others.

A Brand New Day (The Wiz song): "A Brand New Day", also known as "Everybody Rejoice", is a song from the 1975 Broadway musical "The Wiz" written by American R&B singer and songwriter Luther Vandross.  (In 1976 Vandross recorded a version of the song for his album "Luther", on Cotillion Records.)  In the play, the song is sung to celebrate because Dorothy has killed Evilene, the tyrannical Wicked Witch of the West.  Dorothy, the Tin Man, the Cowardly Lion, and the Scarecrow sing the song with the newly freed Winkies, who were ruled and enslaved by Evilene.  It was later featured in the 1978 film version, sung by cast members Diana Ross, Michael Jackson, Nipsey Russell, and Ted Ross (credited as The Wiz Stars).  Given the all-Black cast of "The Wiz", the song's many references to freedom and new possibilities (especially as sung by African American characters who had just been freed from enslavement) certainly invoked the struggles and history of Blacks in America.  In the onscreen version of the song, Nipsey Russell can even be heard exclaiming "Free at last!" —a reference to civil rights activist Martin Luther King Jr. (His impromptu addition to the song is not heard on the soundtrack album version, instead replaced by sung vocals by Diana Ross.)

Today (Elvis Presley album): Today is a studio album by American singer Elvis Presley, released on May 7, 1975 by RCA Records.  The "Today" sessions were held in RCA's Studio C, Hollywood, Los Angeles, California, March 10–12, 1975, and marked the last time Presley would record in a studio.  He last recorded at Studio C, Hollywood in 1972 where he recorded the gold records "Burning Love" and "Separate Ways".  At this time, Elvis was 40 years old.  He was accompanied by his then-current girlfriend, Sheila Ryan.  In the 2005 FTD TODAY release from these sessions, Presley asked her to "step up here Sheila, let me sing to ya baby" on Take 1 of Don McLean's "And I Love You So".  He continued to make "And I Love You So" and "Fairytale" a part of his live concerts until his death.  On stage, he often referred to "Fairytale" as the story of his life.

Vespers in Lutheranism: Vespers is the evening prayer service in the liturgies of the canonical hours.  The word comes from the Greek εσπερινός and its Latin equivalent "vesper", meaning "evening."  In Lutheranism the traditional form has varied widely with time and place.  Martin Luther, in his "German Mass and Order of Divine Service" (1526') recommended reading the gospel in Latin in schools: "Then let another boy read the same chapter in German for practice, and in case any layman were there to hear...In the same way at Vespers, let them sing the Vesper Psalms as sung hitherto, in Latin, with an antiphon; then a hymn, as there is opportunity."  While Latin vespers continued to be said in large churches, many experiments with simplified liturgies were made, including combining the hours of vespers and compline, as in Thomas Cranmer's Anglican evensong.  Under the influence of the 20th century Liturgical movement the Alpirsbach circle reintroduced Gregorian chant and spawned the Evangelisch-Lutherische Gebetsbruderschaft, established in 1954, which publishes the "Breviarium Lipsiensae" or Leipzig Breviary.

Eyn geystlich Gesangk Buchleyn: Eyn geystlich Gesangk Buchleyn (A sacred song booklet), sometimes called First Wittenberg Hymnal and "Chorgesangbuch " (Choir hymnal), was the first German hymnal for choir, published in Wittenberg in 1524 by Johann Walter who collaborated with Martin Luther.  It contains 32 sacred songs, including 24 by Luther, in settings by Walter for three to five parts with the melody in the tenor.  Luther wrote a preface for the part books.  The collection has been called the root of all Protestant song music.

Supporting paragraphs: Martin Luther McCoy Don't Let Me Down (Beatles song)
Answer: "Don't Let Me Down"