New pics -

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Song: Barbara Streisand by Duck Sauce
Performed By: Chris Colfer, Lea Michele & Mark Salling - though, full disclosure, the song only features 3 lyrics - Barbara, Streisand and Oooh. (Scene also features Cory Monteith, Ashley Fink, Jenna Ushkowitz, Harry Shum Jr., Naya Rivera, Heather Morris, Kevin McHale and approximately 4.2 million backup dancers of unknown origin.)
Mark presses a button on a stereo system near the escalator and starts grooving with Ashley and Jenna and Harry as “Barbra Streisand” comes on. Chord and Kevin and Naya and Cory are on the other side. Cory was “on the phone” for some of the takes prior to the song starting. Everyone in the vicinity starts looking up at the escalator as a bunch of dancers (including Chris and Lea) start going down the escalator and dancing. Then the dancers start to stream in as the background extras form a circle around the perimeter. Meanwhile, Chris and Lea start grinding in the middle of it, LOL. Chris totally backs his booty up to Lea while she laughs and then he turns around and starts bodyrolling practically on her. Played off goofy since they were having fun but I was dying and consumed with lust over Chris. The rest of the cast is grooving and dancing (HeMo and Mike doing the choreography, omgosh, HeMo did this booty pop lock and drop it and I almost died, Chord and Naya totally grinding on each other when the beat sets in LOL, off camera though) and joins them and they all make a circle, and the dancers break off into circles too. They do some choreography then they all pause and point to the middle and go, “Barbra Streisand!” during the pause in the song. More choreography, they get into lines this time, then they do more choreography, and then they all disperse.
They did a lot of takes for it but that was the basic scene. It was totally rad. May have just been my imagination going wild, but there was a set blonde family in the middle of it. Sam’s family? Idk, may have just been random extras. Definitely a teenage guy and an older sister, with a mom and a dad.
Everyone started leaving except for Mark, Chris, and Lea. They had to film a quick scene. Mark and Lea ended up leaving a little after three takes. Chris was the only one left and everyone was packing up. (quotes from bodyguard about Chris) “He’s actually about to shoot another take and we have to go to another filming location and he can’t take pictures in their costume, I’m sorry.” “If there’s time [to take a picture] then definitely, but right now, we have to shoot the scene.” Chris shot the scene and then they wrapped.