I have seen concerts stopped through violence, Ian Dury the second or third time we saw him at Oxford's New Theatre which was cancelled through Neanderthals fighting and more recently the Bob Dylan at the Roundhouse where drunken knuckledragging mouthbreathing bottomfeeding Blockheads soured the gig for me and my friend Stephen....we could have done with Dave Grohl of the Foo Fighters at those gigs.....came to dance?.... You betcha!