Beth Gibbons sways with her back to the audience. She's a shy animal who doesn't know where to stand and tucks in to avoid taking up too much space. It might even seem as if she's unaware of the power of her name, inseparable from Portishead, the iconic British trip-hop band of the 1990s with which she became known. It was thanks to Dummy (1994), the trio's debut album, which revealed Gibbons's enchanting power to the world. She was 29 at the time, but already possessed a compelling maturity that seemed to have lived much longer.