The Joanna Newsom covers project was called Versions of Joanna
... which is clearly a pun on Visions of Johanna
... which was a song written by Bob Dylan about Nico
... who was a bandmate of (and whose wonderful Lawns of Dawns was arranged by) John Cale
... who cut an album called Church of Anthrax with Terry Riley
... who apparently lived for a while in Nevada City
... which is where Joanna Newsom grew up.