"Big Brother" is the thirteenth track from Graduation. This track, like the rest of the album has been made public through an internet leak.
The song is an explanation from Kanye West about what sorts of problems he and Jay-Z have had over the years. He talks about being too shy to speak to his idol Jay-Z, being dismayed at not getting to perform at Jay-Z's "Fade to Black" concert at Madison Square Garden, and his current feelings towards his "big brother".
He performed it on September 11th on 106 & Park, after the performance Jay-Z came out and preformed a short verse of "Encore"