The words come from another time, but they spoke to the real significance of Corbyn’s appearance on Glastonbury’s mainstage. Shelly wrote The Masque of Anarchy to mark the occasion of the Peterloo Massacre. An occasion when, on another summer day 198 years prior, a rally of between 60,000 and 100,000 English workers was violently attacked by a local militia, while peacefully protesting for the right to elect their MPs.