An English chronicler of the 16th century visited the French city of Bordeaux and declared that its Cathedral housed the most beautiful and the biggest organ in the Christendom. During the French Revolution the organ was destroyed and its pipes were remelted for the army’s needs. But later another organ was installed, and its monumental facade remains one of the largest in France. As for the biggest organ of France, considering both the size and the number of pipes, it is situated in the Church of St Eustache, Paris. The titular organists of these two French churches are going to perform together in the Catholic Cathedral of Moscow. They will play alternately pieces by Western and Russian classical composers, and the concert will culminate in a joint improvisation on Russian themes.