When she was 10, Eliot Sumner visited San Francisco with her dad, and the two Brits went to Chinatown, where he bought her a set of nunchucks. Not even her dad, who happens to be Sting, could talk airport security out of confiscating them. She was deeply saddened, and did not return. That changes next week, when Sumner, now a 25-year-old singer-songwriter, performs at Popscene. Sumner already has an album to her name, which she released in 2010 as I Blame Coco, a childhood nickname. She’s been largely absent in recent years, and when she decided to write again, Sumner [...]