Born in Saint-Amand-les-Eaux, Nord department of France in a family of carillonneurs, Lannoy was quickly introduced to the bell tradition. He began his musical studies at the Conservatory of Valenciennes where he studied harmony, violin and bassoon with master Fernand Lamy. He was accepted at the Conservatoire de Paris and obtained the supreme awards in the writing classes. He presented himself in vain for the first time for the Prix de Rome in 1938. During his studies at the conservatory, he was also a soldier-musician in the 5thLine Infantry Regiment of Courbevoie. Lannoy was taken prisoner at the beginning of the Second World War and remained so for 5 years despite a few escapes. Sent to Czechoslovakia, he escaped but could not resist visiting Bayreuth, the city of Wagner and was retaken. Sent to Ukraine, in the disciplinary camp of Rawa Ruska, he attempted another escape in 1942, which led to his internment at the citadel of Lemberg. Then sent to Austria in 1943 in a Stalag, he was appointed Kapellmeister and organized orchestras, choirs and even a ballet-mime,Pygmalion, played by prisoners in Poland. He was rewarded for these facts by the médaille de la Résistance, the medal of and the Escapees' Medal. Freed by the American army, he returned to Paris in 1945. At the request of the Americans, he composed the music for the documentary filmHomecoming, recounting the return of prisoners after the Second World War and directed by Henri Cartier-Bresson. For the radio, and at the request of Henri Dutilleux, he composed La légende des pays alliés by Louise de Vilmorin He competed again for the Prix de Rome in 1946 and obtained a second major prize, which earned him the position of director of the Conservatoire de Lille. It was during this period that he married pianist Lola Delwarde, who had a brilliant career as a concert pianist. He conducted many concerts and introduced a whole generation of Lille students to music. Lannoy died in Lille in June 1979.
Arrangements for choir and orchestra of L'amour de moy, Marche des soldats de Turenne, Roule donc, J'aimerai bien apprendre au monde - Camp de Rawa - Ruska - 1942
Chant des déportés - 1943
Le jeu de l'amour et du hasard - one-act cantata - 1st Second Grand Prix de Rome - June 1946
Les prophéties - oratorio for narrator, choir and orchestra - April 1961
Sanctus - male voices and organ for the Choral of the XXX - Wormhout - August 1973
Concerto grosso - January 1938 - for string orchestra and timpani
Cantilène et danse pastorale - Christmas 1943 - for orchestra
Le Retour - January 1945 - Music for Henri Cartier-Bresson's film - Released in Paris on January 24, 1946 at the Champs-Élysées cinema. He made a symphonic suite of it in January 1954.
Lamento ukrainien - Christmas 1948 - State commission - A version for string quartet and a version for chamber orchestra and timpani.
Campanile - February 1951 - Prelude for orchestra
Le Roman de la rose - March 1951 - Ballet mime for chamber orchestra
Les Prophéties - April 1961 - State commission - Oratorio for narrator, choir and symphony orchestra.
