That's because Nas is an Artist not just a rapper, he pushes the boundaries of creativity, sometimes it works sometimes it don't, more often than not it does. For that one off joint like a Braveheart Party you get a Rewind, Summer On Smash you get a Black Bond, Jarreau of Rap you get a Queens Wolf. Making of the Perfect bytch you get a Sekou Story.
Black bond is ridiculously good