I don't know. I don't know what rock or rap is, but I know what it is when I hear it. Same with jazz. What I do know is that it was demonized as literal devil music, or just degenerte music, similar to rock and rap, and that it was heavily segregated. But despite that, most of the top musicians had some of the most intimate and advanced understanding of music and classical theory, and the genre is now associated with snooty high society and exclusive music schools