http://techcrunch.com/2013/12/25/google-rap-genius/
"Google hit back hard today after it learned lyrics site Rap Genius had been using dubious SEO tricks to attain top spots in search results. Now RapGenius.com doesn’t appear on the first page of results for a search of “Rap Genius”, and popular queries like “Jay-Z Holy Grail Lyrics” don’t bring up the startup like they used to."
[Update: But the two companies are working on a resolution.]