And since you'd have to be an avid Lupe Fiasco fan (a la moi) to listen to him talk about what shitty job he worked when he was 17, here's a bonus for you.
A while back I posted some Lupe interview material where he says only 4 of the LASERS tracks were actually made and chosen by him, while the rest were essentially mandated by Atlantic Records. One of the ones he likes (and actually says is his favorite from the album) is "All Black Everything".
Well, it turns out that "A.B.E." was originally a beat intended for Dr. Dre's Detox album. Check it out: