(Credit: Courtesy of California Symphony) California Symphony is set to kick off its new season with Beethoven’s Ninth Symphony. The performances, which are set for Sept. 21 and 22 at Walnut Creek’s Lesher Center for the Arts, will star Laquita Mitchell, Kelley O’Connor, Nicholas Phan, and Sidney Outlaw. They are joined by 100 members of the San Francisco Conservatory of {…}