This post has been updated. See note below for details.
The Pacific Symphony, like other orchestras around the world, is always on the prowl for new ways to bring younger listeners into the fold, and this week the Orange County-based organization is trying perhaps its most ambitious gambit to date with the four-day Wavelength Festival in Costa Mesa.
From Thursday through Sunday, the orchestra will host a broad spectrum of musicians from beyond its usual world of Mozart, Beethoven, Stravinsky and Copland, with concerts at the Pacific Amphitheatre, starting with the blues, rock, folk and pop of Bonnie Raitt and Keb' Mo'.
That will be followed Friday by an indie...