Vehicle horn England, developed a standard electric car horn in 1910. Car horns are usually electric, driven by a flat circular steel diaphragm that has an electromagnet acting on it in one direction and a spring pulling in the opposite direction. The diaphragm is attached to contact points that repeatedly interrupt the current to that electromagnet causing the diaphragm to spring back the other way, which complete the circuit again. This arrangement opens and closes the circuit hundreds of times per second which creates a loud noise like a buzzer or electric bell, which sound enters a horn to be amplified. There
Alarm Will Sound current events, if only for two hours.”) "Canzonas Americanas", their 2012 release on Cantaloupe features music by Derek Bermel whose eclectic approach draws on the musical traditions of Europe, North and South America, and Africa. The San Francisco Classical Voice says about Alarm Will Sound, "It's hard to imagine another ensemble that could handle the vast range of musical ingredients – including rock, Conlon Nancarrow–style layered rhythms, jazz, and especially world music influences ranging from Brazilian choros to West African balafon – that inform this wildly eclectic new document…" The Guardian says, "Bermel tends to build his music layer by