In the medieval period, the dance macabre was a literary or pictorial representation of a procession or dance of both living and dead figures expressing the medieval allegorical concept of the all-conquering and equalizing power of death.
This. This is why the Sith will return and win in the end. So much hate.
While the point that a brief Google search would have given a better answer with less effort than posting here is valid, it is just as easy to pose the answer as it is to mock - or do as I do and link to the answer.