NEW YORK (AP) — Preparing to go on stage for the first time in months after intensive rounds of chemotherapy, an atypically nervous Sharon Jones sat backstage at New York's Beacon Theatre, clutching a cup and shaking. The film documents her transformation into cancer patient and, ultimately, back into a full-throated force. Yet what might have culminated in triumph has instead been complicated by the cancer's reoccurrence, which Jones announced at the film's Toronto Film Festival premiere last fall. On a recent off-day during her tour with the Dap-Kings opening for Hall & Oates, an exhausted Jones laid her head on the table of an Upper East Side bar. The documentary has, the 60-year-old singer says, turned into a kind of motivation for her second round with cancer: visual proof that she got through this once before, and can do it again. Some half-a-dozen records have followed, which staked an early claim to soul music revivals (the Dap-Kings backed Amy Winehouse) and created some classic funk workouts and R&B ballads like "100 Days, 100 Nights." In one scene, shot in a single long take, she attends a small church for spiritual respite from the struggle.