Dorothy Combs Morrison
Dorothy Combs Morrison( born Dorothy Marie Combs, May 8, 1944) is an American gospel music singer.
She sang lead vocal on the song" Oh Happy Day" recorded by the Edwin Hawkins Singers.
Karl Wilhelm (conductor)
Karl Wilhelm, also Carl Wilhelm( 5 September 1815, Schmalkalden – 26 August 1873, Schmalkalden) was a German choral director.
He is best known as the composer of the music of the song “ Die Wacht am Rhein. ”
Alexandru Cristea
Alexandru Cristea( 1890 – 1942) was the composer of the music for" Limba Noastră", current national anthem of Moldova.
Michelangelo Faggioli
Michelangelo Faggioli( 1666–1733) was an Italian lawyer and celebrated amateur composer of humorous cantatas in Neapolitan dialect.
A founder of a new genre of Neapolitan comedy, he was the composer of the opera buffa" La Cilla" in 1706.
Walter Robinson (composer)
Walter Robinson is an African American composer of the late 20th century.
He is most notable for his 1977 song" Harriet Tubman", which has been recorded by folk musicians such as Holly Near, John McCutcheon, and others.
He is also the composer of several operas.
Al J. Neiburg
Allen J. Neiburg (November 22, 1902—July 12, 1978) was an American lyricist.
He was born on 22 November 1902 in St. Albans, Vermont and received his education at Boston University.
He is known for writing lyrics for such songs as "I'm Confessin' (That I Love You)"
(with Doc Dougherty and Ellis Reynolds), "It's the Talk of the Town" and "Under a Blanket of Blue" (with Jerry Livingston and Marty Symes).
He also ran his own publishing company.
Neiburg died in New Haven, Connecticut, on 12 July 1978.
Alexander Courage
Alexander Mair" Sandy" Courage Jr.( December 10, 1919
May 15, 2008) was an American orchestrator, arranger, and composer of music, primarily for television and film.
He is best known as the composer of the theme music for the original" Star Trek" series.
It's a Hap-Hap-Happy Day
"It's a Hap-Hap-Happy Day" is a popular song with words by Sammy Timberg & Winston Sharples and music by Al J. Neiburg.
It was featured in the animated feature film "Gulliver's Travels" in 1939.
It was a hit in the UK in 1940 during the Battle of Britain, having been played heavily on the BBC radio.
Petrus de Domarto
Petrus de Domarto( fl. c. 1445– 1455) was a Franco- Flemish composer of the Renaissance.
He was a contemporary and probable acquaintance of Ockeghem, and was the composer of at least one of the first unified mass cycles to be written in continental Europe.
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.

Question: What nationality is the composer of song It'S A Hap-Hap-Happy Day?
Answer: American