 Complete the following phrase:  Petrov was a pianist and composer of classical and popular music. He stemmed from the family of a Russian emigrant of aristocratic origin family Repnin, a family doctor, resident in Prague-Žižkov. At first, he attended a Russian high school in Prague district Pankrác, during which time he was preparing for his future piano and composition studies at the Music Faculty of the Academy of Performing Arts AMU, taking piano lessons with Berta Kabeláčová and music theory and composition lessons with Miloslav Kabeláč. At the Academy he was Jaroslav Řídkýs student from 1952 to 1956. His graduation composition was the symphonic poem The Vítkov Hill Vítkov  the place of the decisive 