 Now, here in the UK, the Glastonbury Festival is taking place this weekend. What started as a festival of pop, blues and folk music in 1970, attended by about 1,500 people, has now grown into one of the world's biggest performing arts festivals. It features not just the most sought-after acts in pop music, but also theatre, dance, comedy and cabaret performances, and more than 200,000 people now attend over five days, paying more than $400 for the privilege of camping.