"Brooklyn Go Hard" is the second promo single by rap artist Jay-Z, featuring additional vocals by alternative musician Santigold. The song was produced by Kanye West. It appears on the soundtrack to The Notorious B.I.G. biopic Notorious for which it serves as the theme song. It was released on December 1, 2008, as an exclusive download available via subscription to (RED)Wire, with a portion of the profits going towards Bono's Product Red organization. In 2013, it was used in a trailer and several television commercials for the Jackie Robinson biopic 42: The True Story of an American Legend.