She can silence a room with her voice or with a look, depending, which is reminiscent of a certain Nina Simone. Lauryn Hill is superb on her six tracks for the soundtrack to the 2015 documentary What Happened, Miss Simone?, embodying the spirit of her elder. Ms. Hill fronted essential 1990s hip-hop group The Fugees, drifting towards her native Jamaica and jazz, notably with their cover of Roberta Flack’s “Killing Me Softly”. She also created a personal, brilliant solo album, The Miseducation of Lauryn Hill. She’s been described as one of neo-soul’s most intense voices, and she’s back in Montreux for an exceptional one-off.