Dumitrescu has composed a large body of works for acoustic instruments and ensembles as well as works combining acoustic and electronic sounds
and works composed entirely using tape or computer. In its emphasis on long tones that undergo transformations of timbre, Dumitrescu’s music can
be loosely grouped with that of Italian composer Giacinto Scelsi and with the spectral music of fellow Romanian Horatiu Radulescu and the French
composers of the spectral school.