Armenian composer of orchestral, chamber, choral, and piano works that have been successfully performed throughout Europe. He is also a specialist in ancient Armenian music as well as a poet and litrary translator. Petrosyan is winner of important International Composition Competitions. He is the recipient of the Grand Prize at the Vienna International Composition Competition (1998, organized by Claudio Abbado) and Second Prize at the Komitas International Competition of Folk and Spiritual Music (1994). In addition, he was a finalist for the Alexander Zemlinsky Prize (USA, 1999) and served a residency in Herrenhaus-Edenkoben (1998–99, organized by Konrad and Barbara Stahls, with the jury consisting of Peter Eötvös). His work Narek (Symphony-Cantata No. 1) was an immense success when it was performed at the Wien Modern Festival in 2000.