I guess this is how they did flashmobs back in the day.
This flashmob is an homage to the 130th anniversary of the founding of the Spanish city of Banco Sabadell. The flashmob consists of 100 people from the Vallès Symphony Orchestra, the Lieder, Amics de l’Òpera and Coral Belles Arts choirs. Found at YouTube from BancSabadell.
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