Concordia is a well known and respected University here in Canada. I dont have any insight about it's music program but I am sure it follows most University level music Diploma requirements. I will say the city of Montreal is a BLAST!! One of the coolest cities in North America. They host the largest Jazz festival (In the world I believe) one of them anyway. It is stellar.
As an aside - It always amazes me what little most American's know of Canada. Not a slam just true. I am always amazed considering the proximity alone. World geography doesn't seem to be one of the US education system's strong suits!