The neuroscience of Bob Dylan's genius

 http://www.guardian.co.uk/music/2012/apr/06/neuroscience-bob-dylan-genius-creativity
The constant need for insights has shaped the creative process. In fact, these radical breakthroughs are so valuable that we've invented traditions and rituals that increase the probability of an epiphany, making us more likely to hear those remote associations coming from the right hemisphere. 
And this is why poetic forms are so important. When a poet needs to find a rhyming word with exactly three syllables or an adjective that fits the iambic scheme, he ends up uncovering all sorts of unexpected connections; the difficulty of the task accelerates the insight process.
The story of Like A Rolling Stone is a story of creative insight. It took only a few seconds before a mental block became a work of art.