From 2008 to 2014, the New York Times published a blog in their Opinionator section called Measure For Measure. It featured songwriters sharing their thoughts and feelings about songwriting. Lots of great insight from Suzanne Vega, Rosanne Cash, Mike Doughty, Paul Westerberg, Andrew Bird, Jeffrey Lewis, and others. Check it out...
opinionator.blogs.nytimes.com/category/measure-for-measure