Tchaikovsky is known for his ballets: Sleeping Beauty, The Nutcracker, The Swan Lake.
He began a relationship with a wealthy widow who sponsored him for 20 years.
He loved Mozart above all composer. He hated Brahms, and Wagner was boring for him.
He fought all his life to hide his homosexuality. It is believed to have committed suicide because of this. His last symphony (PatheticSymphony) reflects this suffering.