Keep in mind there's a different copyright in a musical composition, meaning the song itself and the sound recording of the composition. Sound recordings have gone to 70 years. Musical compositions in Canada are still life plus 50. I'll give you a concrete example.
A composer whose name was Bert Berns wrote Twist and Shout. I'm friendly with his heirs, and unfortunately he died of a cardiac situation in 1968 when he was in his early 30s. His compositions are coming into the public domain in Canada. His heirs are just slightly older than I am. Never mind the economic impact that has; it means they can't prevent any kind of use from happening, so they lose control over any kind of advertiser making inappropriate use of his music. This perhaps hasn't been a major concern in Canada.
Coming up in the next few years are some very famous Canadian composers whose terms are going to expire. I think that one you should keep in mind is Glenn Gould, who died in 1982. Considering how long it takes to modify copyright law, it would be a good idea to make sure we take care of this now so that the rights to Glenn Gould's catalogue don't expire in Canada—knowing there's a really strange situation where you have a Canadian composer who's an icon in Canada, in the public domain in Canada, but not in the United States and not in Europe.