So sign your soul, I mean your name on the line
And run and tell all your little friends you got signed

from Mighty Casey – Black Rapping School Lyrics on Rap Genius

Meaning

In many stories people sell their soul for success, particularly in music. Blues legend Robert Johnson was said to have sold his soul to the devil to master the blues.

Similarly many rappers sell their souls to the devil (corporate America) for success)

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