Cause there's no rhyme or no reason for nothing

from Eminem – Rhyme or Reason Lyrics on Rap Genius

Meaning

There is no rhyme or reason to the things he raps about; he just gets up on a track and spits what he wants to spit.

In the interview with Zane Lowe, he describes how he just wants to rap on the entire MMLP2, but at the same time making it a cohesive album.
http://www.youtube.com/watch?v=TBux3jStvv4

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