Input (grade 10): The tune is most probably based on the Scottish song "Thou Bonnie Wood Of Craigielea", which Macpherson heard played by a band at the Warrnambool steeplechase.
Output (grade 9): The tune is probably the Scottish song "Thou Bonnie Wood Of Craigielea", which Macpherson heard played by a band at the Warrnambool steeplechase.