'This is an extremely important moment in my professional life," said violinist Sergey Ostrovsky, who appears Thursday night as a soloist with the Israel Philharmonic Orchestra, under Zubin Mehta. "I've already performed with the IPO, but this is the first time that I'm playing under Mehta," he told The Jerusalem Post this week from his Geneva apartment. The 32-year-old Ostrovsky, who was born in Russia into a musical family and immigrated to Israel in his teens, is managing to successfully combine three careers. He is a concert master of the Orchestre de la Suisse Romande, he plays solo, and he continues performing with Aviv Quartet, of which he is a founding member. The Aviv Quartet, which has celebrated its tenth anniversary with more than 100 pieces in its repertory, regularly tours the US and Europe, as well as performing in Israel. "Now, after so many years together, communication between us has become very simple, both on a musical and personal level. It takes no more than a week to learn a new and complicated piece," he said. Ostrovsky, who has just finished his first year with the Orchestre de la Suisse Romande, had nothing but praise for the orchestra and its artistic director, Polish conductor Marek Janowski. "This is an important European orchestra with impressive traditions and variegated repertory, which is undergoing a process of rejuvenation so to speak, with many young musicians becoming new members. I am happy that my colleagues have voted univocally in my favor at the end of my first trial year." Tonight Ostrovsky, who plays a 1716 Granccino violin, performs solo parts in Symphonie Espagnole, by Lalo. The program also features Overture and Aria from Candide, by Bernstein, with mezzo-soprano Marjana Lipovsek, and Cello Concerto, by Saint-SaÃ«ns with cellist Hillel Zori. The concert begins at 20.30 at Mann Auditorium in Tel Aviv.