"My heart is with you ... you are a part of all of us," the Mexican singer said.
"They’re making history here on the sidewalk in front of Paramount Studios and I’m here to support them and express my solidarity,” Morello said.
The Mexican star will perform at the emblematic venue on November 23.
Fans have dubbed the unreleased track "Silver Moon."
The new collaboration between Usher and Keke follows an infamous night at the singer's Vegas residency last month.
On Monday (Aug. 14), the rocker revealed a brand new tattoo on Instagram. Check out what it says and what it means.
"I'mma send someone up there," Drake threatened.
The reimagined REVOLT Summit will take place Sept. 22-24 in Atlanta.
She charts 11 albums on the Billboard 200 for a fifth straight week.
The trek launches in April in Milwaukee, WI.
