Question: What American record producer, songwriter and guitarist wrote and produced the song "My Old Piano" by Diana Ross and is the lead guitarist in the band "Chic"?
Sentence (from "A Brand New Day (The Wiz song)"): Dorothy, the Tin Man, the Cowardly Lion, and the Scarecrow sing the song with the newly freed Winkies, who were ruled and enslaved by Evilene.
Relevant evidence: No