Symphonie du Jeu Vid�o de Montr�al was a concert performed by Orchestre M�tropolitain in 29th September 2017 with music from Assassin’s Creed, Deus Ex, Mass Effect, Dragon Age, Thief and more.
http://orchestremetropolitain.com/fr/concert/la-symphonie-du-jeu-video-de-montreal/

According to this tweet from Eidos Montreal, the video recording was available for limited time. Did someone was able to rip the full concert? :-(


Pour les prochaines 24 heures, vous pouvez �couter le concert Symphonie du Jeu Vid�o de Montr�al, avec du @DeusEx et @Thief! /// For the next 24 hours, you can watch the Montreal Video Game Symphony concert, which includes @DeusEx and @Thief! ♫ https://youtu.be/4L2JWeh6G7k
https://twitter.com/EidosMontreal/status/940652862073442309

I only found these two videos below.
https://www.youtube.com/watch?v=9S5aa-WTyMo
https://www.youtube.com/watch?v=7QKcGD6g53Y
https://www.youtube.com/watch?v=xUd0nvykunA
https://www.facebook.com/Outlastthegame/videos/1366164846828812/