There are literally hundreds of opportunities in the Bay Area to play in a community orchestra, sing formally or informally in a group or choir, and share the joy of music with like-minded individuals.  Here are sites to begin your search:

SF Public Library Art & Music Center • http://www.sfpl.org
A comprehensive listing of Bay Area resources in all areas.

SF Bay Area Chorus Directory • www.choralarchive.org/htdocs/Directory/choruses.html

Google Search Engine listing of SF Bay Area Choruses www.google.com/search?hl=en&ie=UTF8&oe=UTF8&q=SF+Bay+area+choruses

Yahoo Search Engine listing of SF Bay Area Music resources search.yahoo.com/search?p=sf+bay+area+music+groups

Stanford University Music Resource Index • www.stanford.edu/group/Music/

Craigslist Online Bulletin Board – music postings • www.craigslist.org/sfo/muc/  •  Online bulletin board postings for musicians to find groups, equipment, performances, shows, etc.

Community Music Center •  http://www.sfmusic.org/site/index.php?id=26