My Mom went to the light and music show this last Saturday evening.
She loved it, she told me all about it. It is a unique experience.
If you are around Montreal my Mom highly recommend that you don't miss it.
It would take a book to tell you everything my Mom told me; she is an excellent writer/reviewer.
I will go see it myself. It is showing for quite a while, like ten years. I bet they'll addup and improve upon. You can Google it for ample info.
* I should have recorded my Mom, then play the tape here...in French, with English traduction (subtitles).