Sinister: White Horses?

[Andy Arnette]

Got A Question...
  On a tape of 'Tigermilk' that I recently borrowed from a friend there is a
song at the end with Isobel singing something about White Horses.  Does
anybody know what this song is?  My friend claims it's a cover but is anyone
familiar with the original?  I don't have a clue but any help would be
greatly appreciated.
Thanks,
  ANDY

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