The Black Death
https://www.youtube.com/watch?v=rZy6XilXDZQ

I chose this video because it explains perfectly how the black plague started, how it spread throughout Europe, it´s symptoms, and overall everything that happened during and after the plague. How the peasants were the ones that were affected the most by the plague and it killed a lot of them and how they demanded more money from the lords in order for them to work. And it is also a very catchy song, kind of like the one about Constantinople.