It wouldn’t be a Sia video without her young muse, Maddie Ziegler; now the two have gone 4-4, but this time for a worthy cause. In her new single, “The Greatest,” Sia has also teamed with Kendrick Lamar, but it’s the song’s video (which comes sans Kendrick’s verse) that’s, well, the greatest show of unity. The video once again puts Ziegler and her expressive moves center stage, but she’s now one among dozens of ridiculously talented kids. Forty-nine of them, according to those who worked on the video. That number, of course, matches the total number of lives taken in the Orlando nightclub shooting in June. As such, Ziegler dons an all-black wig, rather than her usual platinum blonde, and is seen crying rainbow tears before the video’s haunting final moments. Watch the tribute above, and hear Kendrick’s verse below.