Last part of Prelude, Adagio et Choral Varié Sur Veni Creator opus 4.
Duruflé was born in Louviers, Eure. At age 17, upon moving to Paris, he took private organ lessons with Charles Tournemire, whom he assisted at Basilique Ste-Clotilde, Paris until 1927. In 1920 Duruflé entered the Conservatoire de Paris, eventually graduating with first prizes in organ, harmony, piano accompaniment, and composition. His harmony professor was Jean Gallon.
In 1927, Louis Vierne nominated him as his assistant at Notre-Dame. Duruflé and Vierne remained lifelong friends, and Duruflé was at Vierne's side acting as assistant when Vierne died at the console of the Notre-Dame organ on June 2, 1937, even though Duruflé had become titular organist of St-Étienne-du-Mont in Paris in 1929, a position he held for the rest of his life.
Duruflé was highly critical of his own composition. He only published a handful of works and often continued to edit and change pieces after publication. For instance, the Toccata from Suite, op. 5 has a completely different ending in the first edition than in the more recent version, and the score to the Fugue sur le nom d'Alain originally indicated accelerando throughout. The result of this perfectionism is that his music, especially his organ music, tends to be well polished, and is still frequently performed in concerts by organists around the world.
On St. Omer you obviously miss the big 32' guns in the last part of the toccata, but the organ nevertheless can handle this piece beautifully!