Sophia Magdalena of Denmark
Sophia Magdalena of Denmark (3 July 1746 – 21 August 1813) was Queen of Sweden as the spouse of King Gustav III.
Adib Kheir
Adib Kheir was a leading Syrian nationalist of the 1920s.
He was the owner of the Librairie Universelle in Damascus.
His granddaughter is the spouse of Manaf Tlass.
Maria Teresa, Grand Duchess of Luxembourg
Maria Teresa, Grand Duchess of Luxembourg( born María Teresa Mestre y Batista; on 22 March 1956), is the spouse of Grand Duke Henri.
Theodore F. Morse
Theodore F. Morse (April 13, 1873 – May 25, 1924) was an American composer of popular songs.
Born in Washington D.C., Morse was educated at the Maryland Military & Naval Academy.
He went on to study both violin and piano.
He and his wife, Theodora Morse, became a successful songwriting team for Tin Pan Alley.
Listed as Terriss & Morse, they were one of the earliest Tin Pan Alley husband-wife songwriting teams.
Morse died in New York City.
Mehdi Abrishamchi
Mehdi Abrishamchi is an Iranian People's Mujahedin of Iran( MEK) politician who has been described as" the right hand man of Massoud Rajavi".
He is the former spouse of the group's current leader, Maryam Rajavi, whom he divorced so that she could become the spouse of Massoud Rajavi.
Alonso Mudarra
Alonso Mudarra( c. 1510 – April 1, 1580) was a Spanish composer of the Renaissance, and also played the vihuela, a guitar- shaped string instrument.
He was an innovative composer of instrumental music as well as songs, and was the composer of the earliest surviving music for the guitar.
Gertrude of Bavaria
Gertrude of Saxony and Bavaria( 1152/55–1197) was Duchess of Swabia as the spouse of Duke Frederick IV, and Queen of Denmark as the spouse of King Canute VI.
Marie-Louise Coidavid
Marie Louise Coidavid( 1778 – March 11, 1851), was the Queen of the Kingdom of Haiti 1811 – 20 as the spouse of Henri I of Haiti.
Princess Auguste of Bavaria (1875–1964)
Princess Auguste of Bavaria( 28 April 1877 – 25 June 1964) was a member of the Bavarian Royal House of Wittelsbach and the spouse of Archduke Joseph August of Austria.
Blue Feather
"Blue Feather" is a popular song written in 1909 with music by Theodore F. Morse and lyrics by Jack Mahoney.
In the song the singer is expressing his love for sweet Blue Feather.
The chorus is:

Question: Who is the spouse of the composer of song Blue Feather?
Answer: Theodora Morse