Mazaroff was an elementary school teacher for two years before studying voice at the Sofia academy of music. He made his debut in 1935 in
a secondary role in Knjaz Igor at the National Opera in Sofia.
In 1937, he won a singing competition in Vienna, and was instantly hired by the Vienna Staatsoper, where he was to spend his entire stage
career, through 1952. He gave 342 performances there; his debut was as Radames (the part that he would sing most often), then followed, in
this order: Don Carlo, Don José, Dalibor, Fedja Besrodnyi (Iwan Sergejewitsch Tarassenko by Franz Salmhofer, world
premiere, 9 March 1938), Canio, Cavaradossi, Italienischer Sänger, Rodolfo (his second-most frequent role), Gennaro (I gioielli
della Madonna by Wolf-Ferrari), Manrico, Alfredo, Calaf, Turiddu, Vladimir Igorevich. In 1939, he sang Arnold at the Maggio musicale
in Florence, and at La Scala; further guest appearances in Venice, Rome, Parma, Prague, Sofia, Zagreb, Belgrade, Riga, Budapest and
Barcelona.
From 1953, he sang in concert only, in Bulgaria and the Soviet Union: the last time in 1968. Already from 1962, he taught voice in Vienna.
When young, he was a quite spectacular singer with a clarion voice and an excellent top, as proved by live recordings from the Staatsoper.
He didn't last, though, and soon began to rattle and to quiver, so it's no surprise that his stage career was so short.
Reference 1: Kutsch & Riemens; reference 2: Vienna Staatsoper archives
