That's great! Here's some info on that:

On May 19th, 2012 at six in the evening, what appeared to be a single, tuxedoed street performer playing a bass for people strolling around Plaça de Sant Roc in Sabadell, Spain (just north of Barcelona) turned into a mass ensemble performing a movement of Beethoven's Ninth Symphony — including more than 100 musicians and singers from the Orchestra Simfònica del Vallès, Amics de l’Òpera de Sabadell, Coral Belles Arts, and Cor Lieder Camera

Banco Sabadell of Spain celebrated their 130th anniversary with the flash mob orchestra.
The creative agency for the flashmob was Remake and the film was shot by Onidea.

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