William Reed (9 September 1859 – 2 November 1945) was a Canadian organist, choir conductor, and composer.
 He held numerous organ and choirmaster posts in churches throughout Canada from 1884 until 1913.
 His career in this area was cut short as his deafness worsened.
 He spent the remainder of his career composing and contributing articles to music periodicals like "The Etude".
 His compositional output mainly consists of sacred works, including many anthems and works for solo organ.
 His more well known works include the Christmas cantata "The Message of the Angels" (1910), the cantata "The Burden of the Cross" (1912), the Easter cantata "The Resurrection and the Life" (1911), and the "Grand Choeur in D" for organ (1901).
 His pupil Henri Gagnon considered the latter work "one of the very best Canadian compositions".
The Orff Schulwerk, or simply the Orff Approach, is a developmental approach used in music education.
 It combines music, movement, drama, and speech into lessons that are similar to child's world of play.
 It was developed by the German composer Carl Orff (1895–1982) and colleague Gunild Keetman during the 1920s.
 Carl Orff worked until the end of his life to continue the development and spread of his teaching method.
 The Orff Approach is now used throughout the world to teach students in a natural and comfortable environment.
 The term "schulwerk" is German for (literally) "school work" or "schooling", in this regard in the area of music.
Isabel McNeill Carley (4 December 1918 – 14 July 2011) was a published writer, editor, composer and music teacher.
 She’s considered one of the leaders of the Orff Schulwerk when it began to take hold in the United States in the 1960s.
 As a co-founder of the American Orff-Schulwerk Association (AOSA), Carley contributed greatly to the organization’s beginnings, serving as a board member and magazine editor.
 Carley devoted much of her life to musical instruction, publishing a series of books titled Recorder Improvisation and Technique.
Kalani Das, also known simply as Kalani (birth name Michael Bruno), is an American classically trained percussionist, performer, author, music therapist, educator, and personal development professional.
 He is a frequent keynote speaker and presenter at national and international conferences and is a certified (level III) Orff Schulwerk specialist.
 He has recorded percussion with numerous artists including Yanni and Suzanne Ciani, and has won several awards, including #1 Rock/Pop Percussionist through "DRUM!
 Magazine".
 He has published several instructional books and DVDs, teaching a variety of percussion instruments, including hand drums and small percussion.
 Kalani presents training programs in the drum circle music approach to expressive arts facilitation and in personal development.
Carl Heinrich Maria Orff (] ; (1895--)10 1895 – (1982--)29 1982 ) was a German composer, best known for his cantata "Carmina Burana" (1937).
 In addition to his career as a composer, Orff developed an influential approach toward music education for children.
The German educator Gunild Keetman (5 June 1904, Elberfeld – 14 December 1990, Breitbrunn) was the primary originator of the approach to teaching music known as Orff Schulwerk.
 Keetman was responsible for most of the actual teaching that was done in the early stages of the movement, perhaps most prominently as the teacher for the radio and television broadcasts that popularized the Schulwerk throughout Germany in the 1950s.
"Nun komm, der Heiden Heiland " (original: "Nu kom der Heyden heyland ", English: "Now come, Saviour of the heathens") is a Lutheran chorale of 1524 with words written by Martin Luther, based on "Veni redemptor gentium " by Ambrose.
 It was printed in the Erfurt "Enchiridion" of 1524.
 The chorale was used as the prominent hymn for the first Sunday of Advent for centuries.
 It was used widely in organ settings by Protestant baroque composers, most notably Johann Sebastian Bach: he set it as the opening chorale prelude BWV 599 of Orgelbüchlein; and three times—as BWV 659 (one of his best known organ compositions), BWV 660 and BWV 661—in his Great Eighteen Chorale Preludes.
 Bach used the hymn in his chorale cantata "Nun komm, der Heiden Heiland", BWV 62 (1724) and in the opening chorale fantasia of his earlier cantata "Nun komm, der Heiden Heiland", BWV 61 , BWV 61 (1714).
 Max Reger composed a chorale prelude as No. 29 of his 52 Chorale Preludes, Op. 67 in 1902.
Keith Warren Bissell (12 February 1912 in Meaford, Ontario – 9 May 1992 in Newmarket, Ontario) was a Canadian composer, conductor, and music educator.
 He was particularly known for his choral music, which often implemented elements of Canadian folk music.
 A passionate educator, he was a pupil of Carl Orff and was influential in popularizing the Orff Schulwerk methodology within North America.
 From 1957 to 1958 he was President of the Ontario Music Educators' Association.
 He was conductor and Artistic Director of the National Youth Orchestra of Canada in 1970–1971.
 He also was vice-president of the Canadian Music Council for several years and president of the Canadian Music Centre from 1975-1977.
Dalcroze Eurhythmics, also known as the Dalcroze Method or simply eurhythmics, is one of several developmental approaches including the Kodály Method, Orff Schulwerk and Suzuki Method used to teach music to students.
 Eurhythmics was developed in the early 20th century by Swiss musician and educator Émile Jaques-Dalcroze.
 Dalcroze Eurhythmics teaches concepts of rhythm, structure, and musical expression using movement, and is the concept for which Dalcroze is best known.
 It focuses on allowing the student to gain physical awareness and experience of music through training that takes place through all of the senses, particularly kinesthetic.
Victor August Herbert (February 1, 1859 – May 26, 1924) was an Irish-born, German-raised American composer, cellist and conductor.
 Although Herbert enjoyed important careers as a cello soloist and conductor, he is best known for composing many successful operettas that premiered on Broadway from the 1890s to World War I.
 He was also prominent among the tin pan alley composers and was later a founder of the American Society of Composers, Authors, and Publishers (ASCAP).
 A prolific composer, Herbert produced two operas, a cantata, 43 operettas, incidental music to 10 plays, 31 compositions for orchestra, nine band compositions, nine cello compositions, five violin compositions with piano or orchestra, 22 piano compositions and numerous songs, choral compositions and orchestrations of works by other composers, among other music.

Question: Orff Schulwerk was developed by the composer who was best known for what cantata?
Answer: Carmina Burana