From the Canadian Encyclopedia: http://thecanadianencyclopedia.com/articles/emc/bands
The Children of Peace at Hope (renamed Sharon), Ont, formed a band in 1820; Toronto had an amateur band by 1824; Hamilton, by 1837; Fredericton, Guelph, and Niagara-on-the-Lake, in the 1840s. A former regimental band musician, Jean-Chrysostome Brauneis I, organized a civilian band at Quebec City in 1831, but on his death in 1832 its activities ceased until Charles Sauvageau revived it in 1836 with some 15 players. It was known after 1842 as the Musique Canadienne.
A band formed in Newmarket in 1843 was in 1991 considered the oldest surviving band in Ontario, performing several concerts each year under its conductor Bob Thiel. It was the subject of a 1981 NFB film Goodbye to Sousa which featured William Grieg, who had spent 51 years in the band, 33 as director.