Follow-up to my first post:
The theme used in the two Vidéotron ads in 1987 is similar to a melody found in Firstcom's news theme "Imminence" used by WPEC-TV. The one used in Videotron's ad in 1990 is similar to the end of Firstcom's theme "The Leader". I have also read that there were discontinued music libraries by Airforce Broadcast Services, such as The New Production Library or Power Play, but I did not find anything about them except one album.
So, is it possible that the themes that I explained in my first post:
1) were rearrangements of existing library music themes by Firstcom or any other company?; or
2) were found in the discontinued libraries from Airforce Broadcast Services or some other obscure Canadian library?; or
3) the tracks of the first three videos were actually theme music packages, similar to the "HBO Feature Movie" themes around 1980 or the TSN themes in the early 90s?
4) anything else?
In Videoway's demo, there was another theme at 1:40. Is it also a Maynard Ferguson track?