According to the Tie Me Kangaroo Down, Sport Songfacts, the whoop-whoop-whoop sound in the background came from a wobbleboard, which is basically a sheet of masonite. Originally Harris used the wobble board for his painting before he discovered its musical properties by chance. This happened when he shook one to cool it down after it had been propped up by a paraffin heater and he discovered when he did this it produced an interesting sound.
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