At first, I was going to make a community to discuss CBC shows. Then I wanted a community to share Canadian music artists.
I don't want to make too many small communities, so how do you want this content organized?
Niching down is only required, or even desirable, once there's a critical mass of users cross-talking in a general space. Canada -> Canadian Media -> Canadian TV -> CBC Television -> CBC News -> whatever can be created as the discussions become too much for the more general bucket.