On this day in hip-hop history: The best political rap group takes over one of the country's biggest jails, one girl group's third studio album marks the beginning of the end and more.
In honor of Sam Simon, we take a look at some of the famous rappers and singers who paid a visit to the wacky world of Springfield. From 50 Cent to Pharrell Williams to Lionel Richie to even Tupac Shakur as a hologram, these artists and others poked fun at themselves on the show.