Orchestras I have played in in the past (hopefully that will not be in the past tense forever):
Bay Area Orchestras
South Valley Symphony Performing in Gilroy, CA
Winchester Orchestra Performing at West Valley College and Trinity Cathedral in San Jose
San Benito Stage Company Hollister, CA
Saratoga Drama Group Now known as South Bay Musical Theater Saratoga Civic Theater
West Valley Light Opera Saratoga Civic Theater
Stanford Savoyards Gilbert and Sullivan productions at Dinklespiel on Stanford Campus
The Other Bay Area (Houston, Texas and earlier)
Houston Civic Symphony Met at HBU and performs at various locations from SW Houston to Galveston
Clear Lake Symphony Clear Lake City near Johnson Space Center
Houston Sinfonietta West Houston
Campanile Orchestra Rice University hosts this for non-music majors and members of the greater Rice community
University of Texas College Orchestra Austin Texas late 60s.
Austin Symphony 1964 – 1968 I think.
Corpus Christi Symphony University of Texas Music students filled in sometimes.
Henry Mancini tour 196? Don’t remember.
Midwestern University Chamber Orchestra 1963-64