THURSDAY – We've seen Mozart's Sister play in all sorts of venues. In the dank dark of the Comfort Zone basement. In the red glow of the lights on stage at the Garrison. In the golden sunset of a backyard in Little Portugal. But Thursday night's set at Lee's Palace — part of the epic celebration of Paper Bag Records' 100th release — may very well have been the biggest, most confident set we've seen Caila Thompson-Hannant play yet. The Montreal electro queen was, as always, a captivating presence, coaxing synthetic noises from her instruments, her voice a beguiling shape-shifter, always moving, never still.But that was only the beginning. As the brief set neared its end, Paul Saulnier was waiting in the wings, beginning to slide his fingers across the strings of his electric guitar. The PS I Love You guitarist is easily one of the best our country has to offer. And when he stepped out into the bright lights, his fingers now a blistering blur, an electric roar took Mozart's Sister's electro-pop to a new level. It was a jaw-dropping moment. As Saulnier let loose, Thompson-Hannant was swept away, buckling first to her knees and then collapsing completely on the stage, spent. As the night's host, the CBC's Lana Gay, pointed out later: even the musicians in the green room all crowded to the window overlooking the stage, witnessing a moment that is bound to stand as one of the highlights of this year's festival.