Singer also delivers "Chandelier" with dancer Maddie Ziegler
Maddie Ziegler helms epic dance sequence with group of kids in new video
"We all need to stand together and be a part of creating the future we hope to see," singer says
Sia's "Cheap Thrills" topped the charts, and it could have been Rih's victory
Britney Spears, Sia, Usher and Ariana Grande have also been tapped for two-day festival in Las Vegas
Singer covers Nat King Cole classic for 'Finding Dory' theme song
Miguel and AlunaGeorge to join Sia on Nostalgic for the Present tour
Clip for 'This Is Acting' synth-pop track features 13-year-old Maddie Ziegler
Striking performance was broadcast from South by Southwest
Wigged-out singer and 'Late Late Show' host James Corden duet on "Chandelier" and "Diamonds"
Chris Cornell, the Shins, James Bay and more will perform Lennon/McCartney tracks for upcoming 'Beat Bugs'
A playlist of the cuts that are rocking our world
Roots break out classroom instruments for rendition of Mardi Gras classic
Singer's seventh LP, 'This Is Acting,' will be released on Friday
Revisit anthems the Australian pop genius composed for Rihanna, Katy Perry and others