You said you've been in this 10, I've been in it 5

from Jay Z – Takeover Lyrics on Rap Genius

Meaning

Jay claims to be richer, more successful, and more critically acclaimed than Nas even though Nas has been rapping for twice as long.

To be fair to Nas, Jay is fudging the numbers a bit. He counts Nas’s entire career right from his debut on “Live at the Barbeque” but completely ignores his own output prior to Reasonable Doubt. That leaves out Jay’s work with The Jaz (which began way back in 1986) and early 90s features like “Can I Get Open” and “Show And Prove” which came out around the same time as Nas’s first solo material.

Count both artists' careers from their debut albums and there’s really only two years between them. Technically, if you go by their first features, Jay has a good 5 years on Nas.

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