Armed with a sultry voice, a vintage six-string and a purring, Catwomanesque presence, Holly Golightly is the hottest British export since Earl Grey tea. But — Madonna aside — good looks and killer style aren’t the only components of musical legend, and it’s Golightly’s way with a song that makes her such a treasure. After years of grinding it out in Europe, Golightly amassed a sizable U.S. audience on a duet with Jack White at the end of the White Stripes’ Elephant. She followed that with her finest full-length to date, Truly She Is None Other, which offered a showcase for the singer-songwriter-guitarist’s considerable charms. In concert, Golightly’s torch songs are by turns sexy, angry and sad, underscored by a crack band that moves among rockabilly, blues and country with equal conviction.