Hail The Villian is moving up my list pretty quickly. They're from Oshawa, Ontario.
YouTube - ‪Hail The Villain - Take Back The Fear (Official HD Music Video)‬‎
But I also like State Of Shock and Art Of Dying from Vancouver. Social Code and Tupelo Honey from Edmonton. Age of Daze from New Brunswick. Alexisonfire, Our Lady Peace, Sum 41 and Finger Eleven from Ontario. Evans Blue from Toronto. The Trews from Nova Scotia. Wolf Parade from Quebec.
We have a TON of musical talent in this country.