And now my vocals warm
Add a fifth and a sixth now I'm ready to perform

from Lupe Fiasco – Form Follows Function Lyrics on Rap Genius


He’s warmed up from those four mis in the last verse, but for good measure he adds two more before he performs.

There could be another meaning to this line. His vocals (words) are warm (hot) now on this the supposed deepest song on his fourth album (the fourth “mi”), a fifth and a six referring to his contract with Atlantic forcing him to put out two more albums after this one. He will then most likely retire from rap but be ready to truly perform because he will then be free from all the contractual warm-ups and he can start the real show doing his own thing full out.

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