Realize, how many classics I gave you
Perhaps if you think back you'll realize that I made you

from Nas – U Wanna Be Me Lyrics on Rap Genius

Meaning

Nas made Jay-Z a successful artist. He didn’t literally give him his songs but he definitely gave him a style to run for.
Jay-Z before and after Nas classic Illmatic.

Nas is also referring to the number of times Jay sampled his songs. Dead Presidents, Dead President II, Rap Game/Crack Game etc. Jay-Z is on Nas dick, and Jigga loves it.

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