the song in question:
Brooklyn Go Hard.
Not only references Jackie Robinson but has got to be the first time I've heard Branch Rickey referenced in a rap song. The song came out in like 2008-2009 so it was well in advance of the movie and would only make sense to be somewhat associated with the movie... it's not like they picked 99 Problems or Big Pimpin by Jay-Z and put it in the trailer.