With the steamzillion versions on youtube, the song is now hardwired into my brain- Some singers push it too hard, others, I think, lose the feel of it as they concentrate on their voice or try to make it 'different' from the next fellow's.
It is perhaps the best American song ever written, although I hate to rate music.
I liked Thomas Hampson- this has been a favorite version with me for years. His album "American Dreamer" is a prize. A highly trained singer but he knows when to depart from operatic singing.

I would like to hear Tift Morritt without a large orchestra backing her- she has a fine feel for the song but the orchestra distracted.

De Danaan versions, Mary Black, were good, but- and McGarrigles-

I would like to hear a soloist who sings it quietly, with feeling, and only a few guitar chords (Jim Dalton did some interesting accompaniment with Maggi-).

It is one of those songs that one feels inside himself- perhaps that is why it is hard to agree completely with a performance.

And more to sample-