His first major project was given by Narjiss Nejjar. At 27, he is the one who did the soundtrack Dry eyes, that the director was able to present at the 2003 Cannes Directors' Fortnight. In addition to film dramas and documentaries, he has worked avecDavid Korn-Brzoza, Guy-Roger had the opportunity to touch other areas: he has composed music for theater, for a musical for jingles radio, as well as corporate films. Finally, he even made personal albums,for funis he fun. But the style is still very cinematic, music was composed to support a movie remained imaginary. At this time, he worked on the design of music video games.