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,
Alarm Will Sound musical artists from a variety of backgrounds together with Alarm Will Sound to create new work. In the 2014-2015 season the ensemble worked with Medeski Martin & Wood, Valgeir Sigurðsson, and Adult Fur (St. Louis-based producer). AWS presented two concerts in Colorado with Medeski Martin & Wood presenting new pieces by John Medeski, Billy Martin, Payton MacDonald, and Miles Brown (AWS bassist) as well as arrangements of MMW originals like "End of the World Party" and "Anonymous Skulls." A live album of this cooperation "Omnisphere" was released 14 September 2018. In the 2015-16 season Alarm Will Sound worked with Mira