Among the most chameleonic figures in 21st-century jazz, Esperanza Spalding fills her work with dynamic and inimitable juxtapositions: “Unconditional Love” mixes Joni Mitchell-like melodicism with neo-soul swing and prog-rock intricacy. As a supporting voice, her musical personality is immediately discernible, often showstopping. She steps out to breathtaking effect in ensembles with jazz legends (such as her mentor Wayne Shorter) and has sung alongside past and present pop icons including Bobby McFerrin, Janelle Monáe, and John Legend.