Back in 2012, Pharrell Williams published a coffee-table book called Pharrell: Places and Spaces I’ve Been, where he interviewed the likes of Kanye West, Buzz Aldrin, and Anna Wintour. In one section of the book, he talked to JAY-Z about the grunge takeover of the ‘90s, and Hov noted that Nirvana blocked hip-hop’s cultural ascent for a moment.