Rap Genius began as a rap lyric website, but it has since moved far beyond just rap, with unique home pages for Rock, News, and Poetry. At its heart, the ‘Genius’ sites provide a social-collaborative annotation platform. Like Wikipedia, it’s a crowd-sourced database that allows any users to add content. Unlike Wikipedia, Genius invites users to annotate documents, to break down and close read novels, short stories, poems, and a wide variety of other texts.
Peters, G.D., "Rap Genius in the Classroom" (2014). CUNY Academic Works.