Ballet has long been a source of national pride in Russia, as the country has produced some of the world's most famous dancers and the art form is woven into Russian history. While most ballet careers end by the late thirties, thousands of children dream of performing on stage. Tchaikovsky is the most popular Russian composer, known for his music in ballets like The Nutcracker and Swan Lake. Ice hockey also grew to be a popular sport in Russia, though one of the biggest upsets in sports came when the United States hockey team defeated the favored Soviet Union team at the 1980 Olympics.