As noted in Soundscape: Flash Mob Performances (Part 1) human sound making is one activity that can temporarily change the character of an acoustic space. This posting includes recent musical events that temporarily altered the cultural soundscape two different communities.
Som Sabadell Flashmob (5:41) On the 130th anniversary of the founding of Banco Sabadell, and paying homage to their city, a flashmob of 100 people from the Vallès Symphony Orchestra, the Lieder, Amics de l’Òpera and Coral Belles Arts choirs, performed this Beethoven work on May 19th, 2012 the public square of Sabadell Spain.
Flash Choir in Times Square (7:50) To honor Phillip Glass' 75th birthday, NPR Music commissioned Glass to create a short work to be performed by a flash choir on Times Square in New York City. About 200 singers were involved along with conductor Kent Tritle and soprano soloist Rachel Rosales. The event took place July 10, 2012.