Tchaikovsky resigned from the Moscow Conservatory in 1878 to focus his efforts entirely on composing. As a result, he spent the remainder of his career composing more prolifically than ever. His collective body of work constitutes 169 pieces, including symphonies, operas, ballets, concertos, cantatas and songs. Among his most famed late works are the ballets The Sleeping Beauty (1890) and The Nutcracker (1892).
Tchaikovsky died in St. Petersburg on November 6, 1893. While the cause of his death was officially declared as cholera, some of his biographers believe that he committed suicide.