One of the leading pianists and conductors of our age, Daniel Barenboim is returning to the Principality this March to play at the iconic Opéra de Monte-Carlo, some 50 years since his first appearance here in the 1970s. Barenboim has a story to tell about his friendship with the new director of the Opéra de Monte-Carlo, Cecilia Bartoli.  “I have known Cecilia for many, many years and admired her from the beginning,” says the 80-year-old pianist and conductor, who has worked all over the world. “It is common knowledge that...