As far as I know, I did a search, and you may not know this but, the last song play during a music video of the regional convention, was not of Watchtower. It's stolen from a group called Audiomachine off their album Epica. The song is called Eternal Flame and it is exactly and I mean, note for note the same as the music video. I have links to both the videos here, the convention video and then the Audiomachine video from youtube.
https://www.youtube.com/watch?v=qfkedVv6NvU
https://www.youtube.com/watch?v=6hBBTPmNATM&index=12&list=PLBdTmmVhVoiE_xSl-EjVZ5iMKsyiBC_j-