Half a century after the release of his debut album, are we any closer to fathoming Mr Zimmerman? Fifty years ago today Bob Dylan released his first album, Bob Dylan, on Columbia. Within 12 months he was a rising star; twelve months more and he was the voice of the times; a little over a year later he had gone from saviour to Judas. And on it went. For half a century now successive generations have wrestled with Dylan's mutations; mostly we pick and choose and settle for – at best – a partial understanding. At the age of 70, Dylan's appeal is still wrapped up in mystery, mischief and contradiction. He could even yet, you feel, turn out to be considerably less or more than he appears.