October 21, 2009 > Youth Orchestra Opportunity Youth Orchestra Opportunity YOSAC (Youth Orchestra of Southern Alameda County) offers everything from second year string instruction to an advanced full orchestra. Students playing string, brass, wind (except saxophone), and percussion instruments are all welcome to audition. Rehearsals for Symphony and Intermediate Orchestra are held in the Music Building at Cal State East Bay on Tuesdays. The string groups meet at Bret Harte Middle School in Hayward on Wednesdays. Check the website www.yosac.org for audition or other information.