West, Pharell Williams and Lupe Fiasco each spit a verse. The three rappers make up the Child Rebel Soldier supergroup, which materialized when the trio collaborated on a cut from one of Fiasco's mixtapes. "Pharrell came up with the idea — 'Let's do a group, Child Rebel Soldiers,'" Lupe told MTV News in 2008. "So I did a song. Took Thom Yorke's 'Eraser,' cut it up, put 'Us Placers' on it, because I was going to do a mixtape called Us Placers and remake Thom Yorke's album [The Eraser] and Radiohead's stuff. I sent the record out, and it was initially supposed to have Kanye, and I wanted [British artist] the Streets. The Streets, I got no response. He asked me to do the song for one of his artists. Then Kanye jumped on it and was like, 'I'm going to send it to P.' Then P sent it back, and it was like, 'This is the first song right here. Let's do it.' That was, like, a year and a half ago, and the whole time we've been figuring out what to do."