After obtaining a science diploma, Ledoux turned to music and studied at the Conservatoire de Liège where he met Jean-Louis Robert, Philippe Boesmans, Frederic Rzewski and Henri Pousseur. He also carried out research into electronic music in the CRFMW studio with Patrick Lenfant.
Afterwards, Ledoux pursued his education abroad, notably in Hungary (a Béla Bartók seminar), in Italy (in Bolzano and Venice) where he participated in a seminar by György Ligeti and finally in Paris where he lived for two years on the occasion of IRCAM courses. At the same time, he studied composition with Iannis Xenakis at the University of Paris I.
As a composer he won several competitions (including Lille, Paris and Lausanne). In 2003 he received the Musical Prize from the Civitella Ranieri Foundation of New York for his recent works. His music has been performed in many towns in Europe (Brussels , Paris , Strasbourg , Berlin ) and in Ukraine and Russia. He has performed in North America (with the Colorado Orchestra and the Symphonic Orchestra of Montreal) and Asia (Vietnam, Japan). Latterly, Claude Ledoux has been the composer in residence at the Ensemble Musiques Nouvelles (Belgium: 1998-2000), subsequently at the Castello of Umbria (Italy: 2003). Nowadays, he is composer in residence at the Brussels Bozar (2008-2009).
Due to his passion for Asian sounds, he travelled in several eastern countries in order to undertake research and to learn the traditional art of music. In 1992, he first went through India where he learned ethnic music from the Himalayan slopes to the Rajasthan desert. In 1996, he received a grant from the SPES Foundation to pursue his studies about oriental music in Vietnam, Cambodia and Indonesia. Recently he travelled in Japan (2004) with his wife Nao Momitani, where he went deeper into his knowledge of Nô, Bunraku and Kyôgen.
Claude Ledoux earned a Master in Communication from the University of Liège. Nowadays, he works as a musical journalist as well as a Musical Analysis professor at the Conservatoire National Supérieur de Musique de Paris (France) and Composition professor at the Ecole Supérieure des Arts, Conservatoire de Mons (Belgium). Summer 2008, he taught Musical analysis of contemporary music at the Universities of São Paulo and Campinas (Brazil).
He is also member of The Royal Academies for Science and the Arts of Belgium since 2006.
With the composers Michel Fourgon and Denis Bosse, he has founded in 1998 the Atelier Musicien, a place of creations, experiment and reflexions between composers and performers.