Question: Shall We Dance? was a tune from the musical that was sung by which soprano in the film version?

Context paragraphs:
Don Quixote (1947 film): Don Quixote or Don Quixote de la Mancha (orig.  Spanish title "Don Quijote de la Mancha") is the first sound film version in Spanish of the great classic novel by Miguel de Cervantes Saavedra.  It was directed and adapted by Rafael Gil and released in 1947.  A huge undertaking for Spanish cinema in its day, it was the longest film version of the novel up to that time (two hours and twelve minutes, plus an intermission), and very likely the most faithful, reverently following the book in its dialogue and order of episodes, unlike G.W. Pabst's 1933 version and the later Russian film version, which scrambled up the order of the adventures as many film versions do.  Characters such as Cardenio, Dorotea, and Don Fernando, which are usually omitted because their respective subplots have little to do with the main body of the novel, were kept in this film.

Marni Nixon: Margaret Nixon McEathron (February 22, 1930 – July 24, 2016), known professionally as Marni Nixon, was an American soprano and playback singer for featured actresses in movie musicals.  She was best known for dubbing the singing voices of the leading actresses in films, including "The King and I", "West Side Story", and "My Fair Lady".

Shall We Dance? (1996 film): Shall We Dance?  (Shall we ダンス?  , Sharu wi Dansu? )  is a 1996 Japanese film.  Its title refers to the song "Shall We Dance? " which comes from Rodgers and Hammerstein's "The King and I".  It was directed by Masayuki Suo.

O Sanctissima: "O Sanctissima " (O most holy) is a Roman Catholic hymn in Latin, seeking the prayers of the Blessed Virgin Mary, and often sung in various languages on her feast days.  The earliest known publication was from London in 1792, presenting it as a traditional song from Sicily; but no original source or date has been confirmed for the simple melody or the poetic text.  The tune is often called "Sicilian Mariners Hymn" or similar titles, referring to the seafarers' nightly invocation of Mary as their maternal protector: Our Lady, Star of the Sea.  The tune has been notably reused for the German Christmas carol "O du fröhliche" (O, how joyful), the English recessional hymn "Lord, Dismiss Us With Thy Blessing", and the first half of the American civil rights anthem "We Shall Overcome".

Carol of the Old Ones: "Carol of the Old Ones" is a song originally published in the 1988 HPLHS Solstice Carol Songbook, released by the H. P. Lovecraft Historical Society.  With lyrics written by Andrew Leman, it is sung and performed to the tune of "Carol of the Bells" by Mykola Dmytrovych Leontovych (itself sung to the tune of Shchedryk), with soprano lead vocals and four-part harmony at various points in the song.  The song is performed by The Dagon Tabernacle Choir; the performers' names are Rebecca Marcotte, Digby Dolmen, J.D. Titan, and Walter Forsythe.  It can be found on the album "A Very Scary Solstice".

Too Darn Hot: "Too Darn Hot" is a song written by Cole Porter for his musical "Kiss Me, Kate" (1948).  In the stage version, it is sung at the start of Act 2, and in the 1948 original Broadway production, it was sung by Lorenzo Fuller (as Paul) and Eddie Sledge and Fred Davis (as the specialty dancers), leading the full company.  In the 1953 MGM Hollywood film version, it is moved to a much earlier point, and it is sung by Ann Miller (as Lois Lane, Fred's new girlfriend, who is cast as Bianca).  The song does not really contribute to the plot in either the stage or film versions; in the stage version, the song represents the company of "The Taming of the Shrew" taking a break offstage during the intermission of their play; in the film version it allows the audience to see Lois's fun-loving, risk-taking nature, and gave Ann Miller a chance to show off her dancing skills, specifically tap.  The line 'According to the Kinsey report' (in the original stage production) was changed in the film version to 'According to the latest report'.  The song has also been covered by many artists.

Hello, Young Lovers (song): "Hello, Young Lovers" is a show tune from the 1951 Rodgers and Hammerstein musical, "The King and I."  It is sung by Anna, played by Gertrude Lawrence in the original Broadway production; by Valerie Hobson in the original London West End production; and by Deborah Kerr in the film version (although voiced-over by Marni Nixon).

A Boy Like That: "A Boy Like That" is a song from the 1957 Broadway musical "West Side Story", with music by Leonard Bernstein and lyrics by Stephen Sondheim.  In the musical, the song is paired with "I Have a Love" and is sung by the characters Anita and Maria.  For the original Broadway cast recording, the song was performed by Chita Rivera (Anita) and Carol Lawrence (Maria).  In the 1960 film version the roles were played by Rita Moreno and Natalie Wood, but the songs were dubbed by Betty Wand and Marni Nixon (as both Anita and Maria).  However, the repeat of the two stanzas, sung by Anita, along with Maria's counterpoint of her defense, was omitted because of the complexity of the song, as well as to avoid the repetition, which would have slowed down the pace of the film.

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.)

Shall We Dance? (1951 song): "Shall We Dance?"  is a show tune from the 1951 Rodgers and Hammerstein musical, "The King and I".  It is sung by Anna Leonowens and the King of Siam, played by Gertrude Lawrence (in the original Broadway production) and Yul Brynner respectively.  In addition, it was sung by Valerie Hobson in the original London West End production, and Marni Nixon (who only voiced-over songs while Deborah Kerr acted) in the 1956 film of "The King and I".  The song is about Anna reminiscing over the idea of finding love at an English dance.  The song comes about after a conflict of love's meaning between Anna and the King; the King believes that love is a "silly complication of a pleasant simplicity" and a "fairy tale" while Anna believes that love is real and is natural.  They sing the song "The Song of the King" which expresses predominantly the viewpoint of the King.  After the song, Anna is trying to explain the idea of love in a simple way to the King and becomes caught up in her own experience of love at first sight which is told in the song "Shall We Dance?" .

Supporting paragraphs: Shall We Dance? (1951 song) Marni Nixon
Answer: Margaret Nixon McEathron