One of life’s greatest tragedies is that Linda Ronstadt’s singing voice—a once-in-a-millennium instrument of good in this wicked world—has been silenced due to her struggles with Parkinson’s. That's made clear by directors Rob Epstein and Jeffrey Friedman in Linda Ronstadt: The Sound of My Voice, largely thanks to the numerous clips of Ronstadt's performances they squeeze into the documentary's 95 minutes. Emmylou Harris, in one of the film's most powerful and vulnerable moments, is reduced to tears when she’s reminded her friend can’t ever sing again. And when you hear Ronstadt performing everything from Buddy Holly to Gilbert and Sullivan, chances are you’ll cry too. This free one-week-only engagement is made possible by the Bright Focus Foundation, and includes a special intro from producer James Keach. ROBERT HAM