Imam Tarek Oubrou preaching in Bordeaux mosque before Friday prayers, Bordeaux, Gironde, France, Europe

Detail of minaret of Koutoubia Mosque, with powerful muezzin speakers, Medina of Marrakesh, UNESCO World Heritage Site, Morocco, North Africa, Africa

Speakers' corner, London, England, United Kingdom, Europe

National Gallery of Jamaica, interior, exhibition about Jamaican music, Downtown, Kingston, Kingston Parish, Jamaica, West Indies, Caribbean, Central America

Celebration crossing the Arctic Circle heading south, on Hurtigruten ferry, Norway, Scandinavia, Europe

Speakers' corner, London, England, United Kingdom, Europe

A plaque to the last person who was an exclusively Cornish speaker, Mousehole, Cornwall, England, United Kingdom, Europe

Disc jockey playing music in nightclub

Hispanic mother watching daughter with Down Syndrome pointing to neck

Disc jockey playing music in nightclub

Disc jockey playing music in nightclub

Large European Acoustic Facility acoustics test center

Golden loudspeaker of an old gramophone, Basel, Switzerland

Members of the American Postal Workers Union rally to save six-day mail delivery, Michigan AFL-CIO President Mark Gaffney speaking to the crowd, Detroit, Michigan, USA, America

Antique objects displayed in a room, Phonsavan, Laos

Girl in bathing suit waits at a local shop window, Brazil, north east.

With Vice President Dick Cheney, seated left, and Speaker of the House Nancy Pelosi, D-Calil, seated right, presiding over the speech, President of the United States George W. Bush gives his final State of the Union address to Congress at the Capitol Building on January 28, 2008 in Washington, D.C.

Minaret of the Great Mosque of Asmara, also known as Al Kulafah Al Rashidan, Asmara, Central Region, Eritrea

Jean-Antoine-Panet Quebec Government Office Building; Quebec City, Quebec, Canada

Loudspeaker Used For The Adhan Or Call To Prayer On Ibo Island, Quirimbas National Park, Cabo Delgado, Mozambique

Jean-Antoine-Panet Quebec Government Office Building; Quebec City, Quebec, Canada

Along the Oregon coast stands a Tsunami alarm system, Bandon, OR

Mixing console and speakers in recording studio

Low angle view of outdoor speakers