I never owned the Garden State soundtrack. I didn’t have to: When I first saw the feature-length debut from director-writer-star Zach Braff, I brought many of its songs with me, in the massive Case Logic CD binder stored securely in the backseat of my third-generation Ford Taurus. Swept out of the theater by the strings and loops of Frou Frou’s “Let Go,” I plopped into the driver’s seat, reached for the binder, and put The Shins’ Oh, Inverted World on the stereo. “Caring Is...