From 1961 on, he attended the Franz Liszt Academy of Music, studying composition with Endre Szervánszky and organ with Sebestyén Pécsi.
The first result of his experiments was Impulsioni, a cycle of short electronic pieces from 1974, which won third prize at the Bourges Concours International de Musique Électroacoustique in 1976.
After finishing his studies at the Royal College of Music in 1974, Rózmann settled in Stockholm, spending the rest of his life in and near the Swedish capital.
His first conspicuous public appearance as a composer was the premiere of Bilder inför drömmen och döden (Images of Dream and Death) on 9 March 1978.
[2] In the early eighties, Rózmann started to build a private electroacoustic studio which he installed in the basement of the Catholic Cathedral.
In 1990, a series of three author's nights dedicated to Rózmann was held in the Stockholm centre for contemporary music, Fylkingen.
While almost all of his nearly thirty compositions were performed in Sweden in his lifetime, only one was played in public concert in his native country, Hungary.
During five consecutive afternoons of the Stockholm New Music festival, were played his huge Gloria cycle preceded by Orgelstycke nr IV (Kyrie eleison), under the collective title Mässa (Mass).
The Gloria cycle, an extensive musical setting of the corresponding liturgical text, was composed between 1989 and 2004, and requires some seven hours to perform.
The play is often elaborated in a symbolical and pictorial way with quotations from Buddhist and Christian liturgical music on one side, violent clashing, snarling and devilish laughter on the other.