The rapper was Wiz Khalifa. While I've heard of him, I don't know his music. NASCAR is obviously looking to expand its audience (seeing as its traditional audience is waning), but the reviews I've read are very mixed. The crowd seemed to enjoy the show, but USC had a stand there, so I'm not surprised that it went over well with their students. Personally, I didn't mind the performance, but the concept of having a halftime show in the middle of a race is completely alien to me. Fair enough in football, soccer, rugby or sports that have a natural break, but I can't imagine having an F1 race interrupted by seven minutes of music.