St Vincent — Annie Clark, a 38-year-old singer-guitarist of prodigious gifts — spends a lot of time confounding people. She confounds them with stage shows that are less gig than theatre, ostentatiously choreographed and fabulously provocative (though not in any crude sense). She confounds them with an image that morphs from album to album (for her sixth, Daddy’s Home, she has adopted the dissolute Cassavetes-heroine look).