Without a doubt (imHo)
the list is not complete without Bob Dylan. His contribution helped transform songwriting There are many fine writers who are lauded for style (which is to some degree within the ear of the beholder). Dylan's work goes deeper. I wasn't around in the 60's when people were going through his garbage to find "clues" to the "mystery". But inspite of the weirdness that has occurred around his career his songwriting remains distinct, even essential. Ask Mr Lightfoot. And all the other songwriters.
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