Peter Stojanovic (Petar Stojanovic Lazar) was a Serbian violinist, composer, and teacher born (in Budapest) on September 7, 1877. He is largely forgotten. Several sources have him studying with Jeno Hubay in Vienna and Budapest. I am not aware that Hubay taught in Vienna but I do know he was at the Budapest College of Music and Budapest Conservatory from 1886 onward. At the Vienna Conservatory Stojanovic studied with Jacob Grun, who was also concertmaster of the Vienna Opera Orchestra. Grun was Joseph Joachim's close friend and colleague. In 1925, Stojanovic was appointed professor of violin and composition at the conservatory in Belgrade. He was 48 years old. Stojanovic also concertized throughout Europe as a soloist and with his string quartet. He later founded the Music Academy in Belgrade. Among his compositions are 5 violin concertos, 2 viola concertos, 1 horn concerto, one flute concerto, 2 ballets, 2 tone poems, 3 operas, and diverse chamber music. His most famous pupil is probably Robert Virovai, another obscure violinist. Stojanovic died (in Belgrade) on September 11, 1957, at age 80. The world of classical music had changed drastically by then and he had already become so obscure that the Grove Dictionary of Music (edition of 1953) has no mention of him. You can listen to one of his violin concertos here.