Portrait by Fernand Michaud. Festival d'Avignon 1986
Pierre Georges Cornil Jansen (28 February 1930 - 13 August 2015 at  Saint-Pierre-Saint-Jean) was a French  film scores composer. He was in particular the permanent collaborator of Claude Chabrol for whom he composed the music for many films.
Roubaix, Jansen did his first musical studies at the Conservatoire de Roubaix (piano and harmony) under the direction of Alfred Desenclos. He furthered his studies at the Royal Conservatory of Brussels (piano and harmony prizes) and writing studies with André Souris (harmony, counterpoint, fugue and orchestration).
From 1952 onwards, he regularly attended classes with
Olivier Messiaen and participated in the in Ferienkurse für die neue Musik Darmstadt. In 1958, a suite for piano and 18 instruments was premiered in Darmstadt, and later performed in Paris during a concert of the Domaine musical.
In 1960, he renounced the achievements of the avant-garde and devoted himself to film music. He collaborated with
Claude Chabrol of whom he became the official composer. About Pierre Jansen, the director of the French New Wave said: "I met a brother in music." while the latter described his meeting with Chabrol as "decisive and unexpected.". He then worked with  Claude Goretta, Francis Girod and Pierre Schoendoerffer. He also collaborated for television by composing music for Serge Moati and Josée Dayan.
In 1985, he composed for silent cinema, in collaboration with
Antoine Duhamel, an extensive score for large orchestra to accompany the images of David Wark Griffith's famous . This work was premiered by the Intolerance Orchestre national d'Île-de-France ( Jacques Mercier conducting) and screened live at the Théâtre des Amandiers, then at the Festival d'Avignon.
A version of this film, newly restored, was made in 2007. It required a new adaptation of the score. Rerecorded under the direction of
Jean Deroyer, it was broadcast on Arte. This version is available on DVD.
Gradually abandoning film music because he did not want to fall into commercial ease, he then devoted himself to his own work by composing concerts pieces.
orchestration at the École normale de musique de Paris, as well as at the Conservatoire de Paris (CNSMDP).
Catalogues of works For orchestra:
1 symphony (1995)
Concerto for viola and chamber orchestra (1988)
Éloge de la consonance (1989)
Litanie pour un Eden (1993) Concerto for piano and orchestra (2006)
L'an deux mille, la fin d'un millénaire for choir and orchestra (1999) Duo suite for piano and orchestra (orchestration of the Suite for two pianos) (1987)
Concerto for Saxhorn and Orchestra (2014) For piano:
First sonata (1983)
Second sonata (1986 - 1989)
Twelve pieces for piano
Suite for two pianos (1983) For guitar:
Concerto for guitar and strings (Bèrben 2006)
Evocation d'un Concerto (2006, unpublished)
First String Quartet (1980)
Second string quartet (1991)
Trio for piano, violin and cello (2000)
Sonatina for violin and piano (1977)
Fantaisie toccata et rondes, cello and piano (1981)
3 Caractères (3 Characters) for viola and piano (2003) Duo for violin and viola (2006)
Vagabondages for flute (C and G) and piano (2007) Some chained fragments for bass clarinet and harp
Sonata for violin and piano (2011) Various ensembles:
Sphène for harp quintet (1971)
Les arborescences for brass quintet Quintet concert for clarinet, violin, cello and piano (1993)
Rétro-voyage for alto saxophone, harp, violin, cello, celesta and piano Burlesque for flute, bass clarinet, piston, trombone, percussion, piano, violin and double bass Vocal music:
Six poems from epigrams by Paul Verlaine for baritone and piano
Quatre-Temps for contralto, narrator and piano (there is a version with orchestra).
Le Pain noir (Serge Moati) (TV serials) 1978:
Ciné-roman (Serge Moati) 1980: Mont-Oriol after Guy de Maupassant (Serge Moati)
Discography L'OEuvre pour piano - Erika Haase, piano (1997, 2CDs Triton TRI 331106) -- with works by Colette Zerah-Jansen, interprétées par elle-même. First world recording.
Bibliography Pierre Jansen:
Musikanalyse von Joel Flegler, in: Fanfare: Band 18, Ausgabe 6, Musikmagazin 1995, page 213 Pierre Jansen:
Portrait und Filmmusikanalyse by Royal S. Brown, in: Overtones and Undertones: Reading Film Music, University of California Press 1994, pages 222-225, ISBN 0-520-08544-2 Pierre Jansen:
Profil und Interview by François Porcile and Alain Garel, in: CinémAction - La musique à l'écran, N° 62 January 1992, CinémAction-Corlet, Télérama, pages 55-58, ISBN 2-85480-376-0 Pierre Jansen: Filmographie von Steven C. Smith in: Film Composers Guide - First Edition, Lone Eagle Publishing, Beverly Hills, Kalifornien 1990, pages 78-79, ISBN 0-943728-36-3