Claudio Abbado (Italian pronunciation: [ˈklaudjo abˈbaːdo]; 26 June 1933 – 20 January 2014) was an Italian conductor who was one of the leading conductors of his generation. He served as music director of the La Scala opera house in Milan, principal conductor of the Berlin Philharmonic, principal conductor of the London Symphony Orchestra, principal guest conductor of the Chicago Symphony Orchestra, music director of the Vienna State Opera, founder and director of the Lucerne Festival Orchestra, founder and director of the Mahler Chamber Orchestra, founding artistic director of the Orchestra Mozart and music director of the European Union Youth Orchestra.
Source : Wikipedia