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Australian singer Sia may be as well known for not showing her face–  disguising herself under a blond and black wig — as her big hits (“Chandelier“to name one.) But for Cookie Monster, she agreed to go on camera for a segment on Sesame Street, adorned with only a red nose, and really, really big bow in her trademark wig.

Singing ‘S is for songs’, muppets Elmo, Cookie Monster, Grover and Abby Cadabby help her with back-up vocals during the song.