I have zero knowledge of CRTC. However it should be fairly obvious in most cases what music is NOT 'folk-oriented'- it's only at the margins that there might be some doubt, in which case it becomes a matter of opinion.

My guess is they wouldn't be interested if you play the occasional questionable track. What is more likely to attract their attention is if you appear to be using the special category to obtain special privileges which you're then abusing by playing a large proportion of non-complying music. They're not the folk police and won't be interested in the esoteric arguments we get into on here. I don't think they're likely to come down on you over individual tracks, however if you were to put on shows consisting entirely of heavy metal, disco, jazz or classical then they might take an interest.