Knockin On Heaven's Door is a song originally done by Bob Dylan in 1973 and later covered by Guns N Roses for their 1991 album Use Your Illusion II. It was featured on The X Factor by Fifth Harmony's Ally Brooke and Julia Bullock in Boot Camp 2. After this performance neither of the two were picked to go to Judges Houses, with the exception of Ally, who was put into Fifth Harmony after she was eliminated.
Simon said that both (Ally & Julia) have different league and L.A. Reid said: "Somebody won and somebody lost in that battle"
- This is the first and only time Ally and Julia performed together.
- Ally's skirt was censored in the video.