Last night (Sept. 21st) Common held his inaugural AAHH! Fest in his hometown Chicago, which featured performances by De La Soul, Lupe Fiasco, and Jennifer Hudson. During Common's set, however, he brought out a "very special guest". Kanye West eventually surprised the crowd, performing The College Dropout cut "Get Em High" with Common as well as songs like "Jesus Walks", "Can't Tell Me Nothing", "Power", "All of the Lights", and more. Videos after the jump!