Coming upon this old thread, I see a reference to a song by Tom Paxton about Phil Ochs' suicide, but none to "No More Songs," which was simply a suicide note set to a tune.

Ochs' "The Scorpion Departs but Never Returns" should qualify as the second-saddest song, overtly about the disappearance of a nuclear submarine but reflecting the death of an age and loss of meaning.

"We will forgive you, we will forgive you
Tell me we will forgive you"