Was it controversial for you to take music that has many different forms but some of them are fairly harsh and fairly controversial and say we're going to do this.

NPR: Hip Hop Takes on Diplomatic Role with State Department

But Mr Horspool's achievement is to show the sheer extent to which rebellion in its many different shapes and forms has been a continuous and conscious tradition shaping the behaviour of both the ruled and their rulers.

ECONOMIST: Political rebels in England