Maybe what the critics have really revealed is something about attitudes that are still all too prevalent in Britain: an instinct to go back to base and play safe. An innate conservatism, a stifling reluctance to try something different.
This is not something that Glastonbury has ever embraced. And there is also an interesting undercurrent in the suggestion that a black, US hip-hop artist shouldn't be playing in front of what many perceive to be a white, middle-class audience. I'm not sure what to call it, at least not in public, but this is something that causes me some disquiet.
In the end, this is nothing Glastonbury has not faced before. It is just another chapter in Glastonbury's colourful history. Back in 1984, there were similar criticisms made when The Smiths were named as the headline act. Hippies just wanted acts that had played before. A disgruntled stage hand even deliberately mis-spelt The Smiths' name on the stage. The reason we had the Smiths perform then is the same reason Jay-Z will play this year – Glastonbury must continue to evolve and develop. With so many smaller music events cropping up, it needs to keep moving and trying new things, whether hip-hop, African music or just an amazing new indie group. That is what has made it so popular for so long.