Lady Gaga performance of "Til it Happens to You" was one of the most powerful moments at Oscars 2016. Victims of sexual violence joined her on stage SUBSCRIBE to ABC NEWS: www.youtube.com/ABCNews/ Watch More on abcnews.go.com/ LIKE ABC News on FACEBOOK www.facebook.com/abcnews FOLLOW ABC News on TWITTER: twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: gma.yahoo.com/