In "Back to the Future 2," Marty McFly and Doc Brown chartered a course for October 21, 2015 to prevent a McFly family crisis. Today is October 21, 2015. 

The "Back the Future" movies play an important role in hip hop. They have been referenced in countless rap songs, the best reference probably being Ludacris' incredible 2011 mixtape 1.21 Gigawatts (Back To The First Time). But importantly, they predicted many modern rap trends that no one or nothing else in the '80s saw coming.

Here are 5 ways Doc Brown and Marty McFly's adventures foresaw the modern landscape of hip hop.