I stumbled across this video at the Why Homeschool blog:
Now, I’m no Lady Gaga fan — but I am gaga over this video! It was produced by a history teacher and a technology specialist. On youtube.com, where they offer over 50 videos, they go by the name historyteachers. Children will have fun learning about the Crusades, the Spanish Inquisition and the Vikings with the oh-so-clever lyrics set to the tune of popular music by the likes of ABBA, Justin Timberlake, Blondie, Britney Spears and more. Hats off to historyteachers — great work!