With her quicksilver voice, incisively poetic lyrics, and musical nods to jazz, folk, and beyond, Joni Mitchell spawned legions of acolytes. The Canadian singer/songwriter's influence is heard in the sly beatnik art pop of peers like Rickie Lee Jones and Carly Simon, the rich ballads of later artists like Taylor Swift and Laura Marling, and the crystalline vocals of musical outliers like Björk.