(copied from the video’s description:) Kampens väg (The Way of Struggle) by Dan Berglund is an epic Swedish socialist song from 1975. It tells the story of class struggle through history, all the way from stone age people arriving in Sweden, past medieval times and industrialism to the vision of a future when the working class takes power in a socialist revolution.

The history of all hitherto existing society is the history of class struggles, and this song really tells the story of how that might have looked in practice.