An interesting tale which I would have liked to include in my family history narrative, so I investigated further. It seems that Peace Day Riots did indeed take place on July 19th 1919 and resulted in the Town Hall being destroyed by fire. In fact three pianos were dragged out of a neighbouring music shop, but all reports I've seen suggest that this was Farmer's Music Shop and not Arthur Day's. Kelly's 1914 directory, the most recent I have access to, lists a Farmer S & Co, pianoforte warehouses, in 2 Wellington St (also 85 George St), so these were most likely the premises the pianos would have been dragged from. Shame really, a nice little ditty! Thanks for bringing it to my attention.