Over the past few years we have seen videos on YouTube of various Flash Mobs happening all over the world. The major one would the one done for commercial at a train station in Belguim to Julie Andrew’s rendition of Do-Re-Mi from The Sound of Music:

Searching online there have been other flash mobs of all kinds happening all over the place. Here are a few holiday ones:
First the Hallelujah Chorus

And here is a medley of various Christmas carols

So why am I going on about all this?
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