It's a scene out of a musical- walking through Union square, and suddenly strangers begin to dance and sing- one voice at first, and soon a chorus line appears out of seemingly nowhere.
Only it's not a movie, it's a San Francisco based performance art group calling them selves "Public Displays of Musical Affection". The Video itself is called 1...2...3:45 6/7/8. Uploaded by Billy Green who was clearly deeply involved in the project. Kudos to all who took part.
A long distance dedication for a friend to whom this pertains...
Don't you love it when the world bursts into song?