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Otto Deden (Amsterdam, November 19, 1925) is a Dutch composer, music educator, conductor, teacher and organist.
He was son of Catharina Maria de Jong and merchant Lambertus Leonardus Deden. He himself married S.A. Van Dyke.
In 1948, Otto Deden obtained the Laureate at the Roman Catholic Church Music School in Utrecht, where he was taught by, among others, Hendrik Andriessen, Wouter Paap, Herman Strategier and Albert de Klerk.
After completing his military service in the Dutch East Indies, he accepted the appointment of director-organist at the St. Antonius Church in Dordrecht in 1950. In the following years he conducted chamber choirs and Royal Men's Choirs in Limburg and North Brabant. Between 1962 and 1969 he was conductor of Venlona. He succeeded Jos Vranken and was himself succeeded by Ger Withag. He still studied composition with Henk Badings. Numerous compositions have been written by him, profane to religious works, including masses, various motets, cantatas, oratorios, piano and organ works, including commissioned works such as the Declamatorium Kain and the Antwerp Suite.
Otto Deden was a music teacher at the Titus Brandsma College in Dordrecht for 25 years. In 1982 he was appointed Knight in the Order of Orange Nassau. He was also appointed Knight in the Order of Saint Gregory the Great and he acquired the bronze medal of honor from the city of Dordrecht.