No need to see it here. I’ve got it at least three times on E mail. Watched it every time and enjoyed it every time. The other “flash” concert was the one in ? looks like grand central station but not sure. They did the song from “The sound of Music” Doe a dear a female deer etc. etc. many singers and they danced to theirs.
I think there is an Interwebz controversy on whether this was a true “flash mob.”
When the “mob” deferred to a couple of soloists at different passages I knew this was not spontaneous at all: it was planned.
But it was an excellent rendition, even if a little less than honest.