"49 beautiful lives lost. This is for you," one of the video's dancers writes.
New track "The Greatest" released by Sia and Kendrick Lamar starring Maddie Ziegler. #WeAreYourChildren reads the hashtag in the beginning of the video, which opens to a black screen.
Maddie accompanied by 49 dancers is set to represent 49 lives lost in the Orlando nightclub shooting.
“Uh-oh, running out of breath, but I
Oh, I, I got stamina
Uh-oh, running now, I close my eyes
Well, oh, I got stamina
And uh-oh, I see another mountain to climb
But I, I, I got stamina
Uh-oh, I need another love, be mine
Cause I, I, I got stamina”