Fellini’s credo ‘the visionary is the only true realist’ could also be applied to the life of Claudio Abbado, who died earlier this week in Bologna at the age of 80. It would be wrong to think of Abbado as a dreamer, for conducting at the angelic heights to which he ascended is a matter of serious thought, but he had the gift, rarer than is commonly supposed, of liberating musicians.