Schumann suffered from manic depression. When he was depressed he hardly wrote anything, but 1840 was a happy year for him and he wrote lots of songs as well as orchestral music. In 1841 he wrote four symphonies. In 1842 they went on a concert tour together, but Schumann found it difficult because Clara was more famous than he was. He returned alone to Leipzig to work at his publishing. He felt depressed again at this time and drank a lot of beer and champagne. He was happy again when Clara returned, and composed some chamber music. In 1844 they toured Russia and played to the Tsar. By August he had a complete nervous breakdown and could not bear to listen to his own music. It took him some time to recover.