The truly elusive chanteuse Sia performed her single “Chandelier†at Logo’s Trailblazers special alongside the New York City Gay Men’s Chorus, whose members were outfitted in the signature Sia bob. As is her wont, Sia performed with her back to the audience while a similarly bewigged stand-in danced onstage — this time, “Chandelier†music video choreographer Ryan Heffington in roomy pants and a thick mustache. You might remember that she did this before with Maddie Ziegler, star of Dance Moms, on Ellen and Lena Dunham on Late Night With Seth Meyers. We’d rate this one somewhere in between the two of those.