Keyboardist George Duke helped enrich a whole mess of funky pop and jazz recordings. On Michael Jackson's “Off the Wall,” his shiny chords seep into a disco-pop pulse, while his playfully melodic solo peaks on the syncopated fusion of John Scofield's “Loud Jazz.” Duke also worked with art rocker Frank Zappa, honing his eccentric synth contortions on complex workouts like “Inca Roads.”