It’s a fifth appearance at Montreux for this singer in from the cold who has her musical family to keep her warm. A key figure of contemporary jazz, Diana Krall bewitches with her rounded contralto timbre and her piano rambles, for which she’s been awarded several Grammies. In her most recent album, Glad Rag Doll (2012), Diana mischievously extracts the charm from ’20s standards and polishes them up as though... see more