In 1970, the year I was born, Rolling Stone magazine published a review by learned rock journalist Greil Marcus of what was then Bob Dylan's latest album, Self-Portrait.  The review's high impact opening sentence has since earned itself a place in the annals of popular culture for its succinct precision and evocative use of language.  It simply asked the question:  'What is this shit?' It's 2010 and Bob Dylan and Greil Marcus are both nearly 40 years older and I'm nearly 40 years-old.  Dylan has just performed a storming set on a sizzling Saturday night in front of Clare, the [...]