Sia was on Ellen today, and in signature style, her performance was elaborate and identity-obfuscating. As usual, tiny dancer Maddie Ziegler was there, but not as per usual, so were a bunch of other tweens in giant white boxes. To all those boring musicians who just stand there and sing a song while plaintively holding a microphone, it is time to step up your game. Lip-synching tweens in boxes has now been done, though, so come up with something else.