johnny cash-i see a darkness

i once had a theory that all the best music was unheard. that when music was pure it was unrecordable. that the worlds most beautiful songs just evaporated into the ether.
this is johnny cash doing a version of will oldham's 'i see a darkness'. so stark. cash at the end of his life, barely croaking out the song. the ghost of june carter cash haunts every word. when will oldham joins him on the chorus it's almost too much to bear.
i've got tons of other bullshit theories.