Prefix points towards some pro-shot footage from the SWU Music & Arts Festival in São Paulo, Brazil featuring a performance from Kanye West. The video shows that during "All of the Lights" he got Fergie from the Black Eyed Peas to come on stage to help out before leading into crowd pleaser, "Stronger". Prefix also points out that he performance with Fergie was the first time they'd performed the track together live which seems weird, no? Whatever, it's nice to see Kanye on a stage minus Jay Z performing for the masses at a Festival. Here's to hoping he maybe appears at another UK festival next summer.