Wow, you really touched on a lodestone. Tim Hardin was a superb songwriter and soulful singer. He had the ability to create songs with a core of mystery and wonder. I find myself wondering what his songs are 'really' about even 40 years on. 'Red Balloon' and 'Shiloh Town' are representative examples.
Despite the fact that he was 'successful' in his time, I find his music and, especially his singing to be seriously underrated. Like other truly original artists, you always got the feeling at one of his shows that anything, and I mean anything, could happen.