In this Special edition of the Naked Scientists, we explore the science of the Glastonbury Festival. We find out what it takes to turn a farm into a city and back every year, and how to keep clean water flowing in, and waste flowing out, for nearly 200,000 revellers. We examine the scientific issues being discussed at the festival by groups like Greenpeace and Water Aid, and ask Baba Brinkman, Paloma Faith, Josie Long and Robin Ince if scientific discussion can find a home at a festival of performing arts. Like this podcast? Please help us by supporting the Naked Scientists)