Question: The cover art for Johnny Griffin's album "The Congregation" was by an American artist who was a leading figure in the visual art movement known as what?
Sentence (from "Andy Warhol"): Andy Warhol ( ; born Andrew Warhola; August 6, 1928 – February 22, 1987) was an American artist, director and producer who was a leading figure in the visual art movement known as pop art.
Relevant evidence: Yes