Queen songstress Zap Mama recently lent her harmonious pipes to The Miguel Atwood-Ferguson Ensemble for a heartfelt rendition of Issac Hayes' "Walk On By" at That 70s Soul concert in LA. The singer — forever an Okayplayer for her collabos on Electric Circus, Things Fall Apart, and Worldwide Underground amongst plenty others — expertly tip-toed around the arrangement at first, slowly building up to a culmination full of her signature African-rooted vocal inflections. Watch below and download the track over at ArtDontSleep for the price of an e-mail.