It's called "Hands" and it features Mary J Blige, Jason Derulo, Britney Spears, Tyler Glenn, Selena Gomez, Halsey, Ty Herndon, Imagine Dragons, Juanes, Adam Lambert, Mary Lambert, Jennifer Lopez, the Trans Chorus of Los Angeles, Kacey Musgraves, MNEK, Alex Newell, P!nk, Prince Royce, Nate Ruess, RuPaul, Troye Sivan, Jussie Smollett, Gwen Stefani, and Meghan Trainor.