Esperanza Spalding on Role-Playing Jazz-Rock Opus 'Emily's D+Evolution'

A surprise “Best New Artist” Grammy win made jazz instrumentalist Esperanza Spalding break into mainstream consciousness, but the bassist singer-songwriter has always been ducking expectations. Her albums swing from the string arrangements of 2010’s Chamber Music Society to the contemporary-pop moves of 2012’s Q-Tip-assisted Radio Music Society. She’ll back up…