When A Small Girl Dropped Money Into A Hat, She Sparked A Flash Mob That Left Onlookers Spellbound

It is late spring 2012 in the bustling Catalonian city of Sabadell. The day is drawing to a close; bells sound out the hour of six in the evening. And in Plaça de Sant Roc small groups of people walk and cycle in the square, criss-crossing in front of the stately town hall. Then a young girl stoops to place a coin in the hat of a busker – and nobody could have anticipated what happens next.