Vehicle horn horn. Bicycles often have a classic "bulb horn", operated by squeezing a rubber bulb attached to a metal horn. Squeezing the bulb forces air through a steel reed located in the throat of the horn, making it vibrate, producing a single note. The flaring horn matches the acoustic impedance of the reed to the open air, radiating the sound waves efficiently, making the sound louder. Other types of horns used on bicycles include battery-operated horns (sometimes even car horns on 12-volt circuits are incorporated) and small air horns powered by a small can of compressed gas. Oliver Lucas of Birmingham,
Sound the Alarm (band) Joe Brule joined the band, Sleepwell began writing original material and won local acclaim. Working with Rob Freeman, then of Hidden In Plain View, Sleepwell recorded a demo and word spread quickly about the band. In 2004, they were courted by producer Howard Benson while still students at Bangor Area High School. The band changed its name to Sound The Alarm because of a threatened lawsuit by a mattress company alleging that the name "Sleepwell" infringed on their copyright. The group graduated early from high school in 2005, newly christened as Sound The Alarm, released an EP on Rock Ridge