While writing a cover story about Kanye, Common, and John Legend for VIBE back in 2005, Complex’s Editor-in-Chief Noah Callahan-Bever observed something interesting in the studio with Kanye: He kept a piece of paper with side-by-side track listings. Kanye later admitted that he did it “so that he can be sure that his LP hangs song-for-song with Common’s [Be].”

That might sound a bit odd since they’re both on the same team, but considering that Kanye produced most of Be and the best players always say "your only competition is yourself," it totally makes sense.