California Youth Symphony (CYS) is a San Francisco Bay Area symphony orchestra for young musicians of high school age and younger. It was founded in 1952 by Aaron Sten and in 1963 became the first United States youth orchestra to tour abroad, performing twelve concerts in Japan, including a joint concert with Tokyo Junior Orchestra Society. Since then, the orchestra has toured Mexico, Australia, Uruguay, Argentina and several countries in Europe and Asia. In 1994, the orchestra placed first in the International Youth and Music Festival Competition in Vienna. The orchestra has also collaborated with youth orchestras in Japan and in Switzerland. During the summer of 2014, the orchestra is touring in Eastern Europe, and will perform in Slovakia, Slovenia, Croatia, and the Czech Republic. Leo