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Marc de Ranse (20 April 1881 – 12 February 1951) was a French pianist, organist, choir-master and composer.

Biography
De Ranse discovered his vocation at the Collège Saint-Caprais in Agen, where he met Joseph Schluty (1829-1920) who was organist at Agen cathedral. In 1897, de Ranse left Agen for the Schola Cantorum in Paris, where he studied composition under Vincent d'Indy, harmony first under Léon de Saint-Réquier and then under Fernand de la Tombelle, counterpoint under Albert Roussel, piano under Gabriel Grovlez, vocal ensemble under Charles Bordes, organ under Abel Decaux and then Alexandre Guilmant, and Gregorian under Amédée Gastoué. He remained a student at the Schola Cantorum until 1907, with an interruption for military service between 1902 and 1905.

After completing his studies, he began a career as a church musician, composing for organ and harmonium and founding the Concerts spirituels de Saint-Louis d'Antin with Joseph Boulnois. At the time his Six variations on the liturgical Stabat Mater were published in Joubert's 1911 collection Les Maîtres Contemporains de l'Orgue, he was choir-master at St-Louis d'Antin and teaching courses for church musicians at the Schola Cantorum. While serving in Belgium during the First World War, he was wounded and taken prisoner. The Germans sent him to Switzerland for medical care in 1916, and it was here that he became conductor of the Orchestre Symphonique des Internés Alliés.

He returned to Paris in 1919, and resumed his earlier activities as organist in various churches. In 1921, he became a choir master and founded the Chœur Mixte de Paris, a professional choir that took part in major symphonic concerts such as the Concerts du Conservatoire, Concerts Lamoureux and the Concerts Pasdeloup. He also served as choir master at the church of St. Marcel in St.-Charles de Monceau and at the church of St.-Denis du St-Sacrement. In 1927, assisted by Gustave Daumas, Carlo Boller and Paul Doncœur, he published the first version of the popular song collection "Roland". From 1929 to 1933, he also ran the Institut grégorien de Paris.

In 1933, he decided for both personal and professional reasons to retire to Aiguillon, where he had been born. He inherited the title of Baron on the death of his father in 1924, and was made a Chevalier de la Légion d’Honneur en 1934.

His substantial output covers a wide range of genres: piano solo and piano 4 hands, music for the theatre, music for harmonium or organ (manuals only), organ (with pedals), chamber music, symphonic music, vocal music and orchestrations.