Whoa, educational videos have changed a little since I was in high school. This video is by a group called History for Music Lovers (@historyteacherz). Their Bubonic Plague rap is set to Gwen Stefani’s Hollaback Girl. From the comments on You-tube, its being shown in history classes, over 700,000 hits as of Nov. 15, 2012.
h/t to Tara Smith at Aetiology.