I'm stealing time from my employer, so I don't have time to do this topic justice (even if I could!). So I'm going to ignore modern singer-songwriters, and instrumental music, neither of which overlap a great deal with traditional singers.

Canada is a young country, and its immigrants brought traditional music from their own backgrounds, and some of these started to influence each other, but nowhere near arriving at a homogeneous style, so in a sense we're talking about a "Canadian style" which may not exist, or may just be in the process of developing. (But this development may be swamped by "modern" influences anyway, and disappear before it gets a chance to develop fully.) There are lots of recorded examples of singers whose style is indistinguishable from people in the Old Country. There are also songs written in Canada whose style would fit into those genres. (I'm including the French cultures as well as British and other backgrounds -- it applies to any non-aboriginal cultures.)

I'm not a student of traditional music, I've just listened to a lot of it, so I can't quote chapter and verse on this. At the risk of overgeneralizing, I'd say that there is a tendency for Canadian singers to strengthen the rhythm and simplify the ornamentation on songs they've inherited from the Old Country. For example, singers who sing old Irish songs tend to regularize the tempo and reduce the number of grace notes.

(I have some credentials here; I'm secretary of the Canadian Society for Traditional Music, co-editor of the Canadian Folk Music Bulletin and former president of the Canadian Folk Music Society. Not that titles matter, but just to show that this is an area I've spent time on.)

Must rush off. I hope this discussion hasn't disappeared by the time I get back to work on Monday.