There are already at least two major discussions about this. They are here:

https://news.ycombinator.com/item?id=6960211

  Open Letter to Google About Rap Genius SEO
  (rapgenius.com)

https://news.ycombinator.com/item?id=6963365

  Google Has Officially Penalized Rap Genius For
  Link Schemes (searchengineland.com)

========

Minor discussions:

https://news.ycombinator.com/item?id=6963682

  Google Destroys Rap Genius’ Search Result Rankings
  As Punishment For SEO Spam (techcrunch.com)

https://news.ycombinator.com/item?id=6961243

  The Hideous SEO Strategy of Rap Genius
  (rocketmill.co.uk)

========

Other submissions:

https://news.ycombinator.com/item?id=6963568

  How Rap Genius Won The SEO Game (billboard.com)

https://news.ycombinator.com/item?id=6961756

  Rap Genius Apologizes For Not-So-Genius SEO
  Spam Tactics (techcrunch.com)

https://news.ycombinator.com/item?id=6960362

  Here's How Rap Genius Should Be Building Links

https://news.ycombinator.com/item?id=6964012

  Rap Genius - Spammy SEO Strategy (rocketmill.co.uk)

https://news.ycombinator.com/item?id=6964169

  Should RapGenius be able to "negotiate" with
  Matt Cutts and Google?