Lupe Fiasco f/ Matthew Santos "Shining Down" (2009)
Lupe Fiasco scored one of the biggest hits of his career with 2007's "Superstar," a pop-leaning collaboration with singer-songwriter Matthew Santos. The duo later reconvened for "Shining Down," which was intended to be the lead single from Lupe's then-untitled third album. But the spark was gone. Fiasco's raps were on-point, but Santos' warbling chorus was more taken with vocal gymnastics than listenability. By the time Lasers was released, "Shining Down" had been downgraded to the album's deluxe edition-a sutble way to admit the song wasn't the hit it was meant to be.