It's all good cause the streets is A&R'ing this

from Jay Z (Ft. Pharrell Williams) – So Ambitious Lyrics on Rap Genius

Meaning

People who work in A&R are the ones who develop an artist, find the right producers, etc. In reference to the opening of the 3rd verse, no one was willing to do the professional development of Jay’s music, so this line is saying his talent was developed, or honed, on the streets.

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