With the flower-power soul of "Walkin' in the Sun" bumping against the disco sizzle of "Life Is a Dance" and the feminist funk of "I'm a Woman (I'm a Backbone)", Chaka Khan took her band Rufus through every twist and turn of modern R&B. And she went beyond, with her own solo material: Check out her foray, alongside Mary J. Blige, into slick neo-soul with "Disrespectful" and the proggy jazz of "And the Melody Still Lingers On (Night in Tunisia)".