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,
Loud City Song compositions are even more beautiful than "Ekstasis", even though they're often more fragmented—but it's also a frightening depiction of what it feels like to have a whole population making you up in its head." Lindsay Zoladz of "Pitchfork" stated, "Though it draws upon the distant past, Julia Holter's made a timeless people-watching soundtrack: an acutely felt ode to the mysteries of a million passersby, all the stars of their own silent musicals." Adam Kivel of "Consequence of Sound" stated, ""Loud City Song" is a sightseeing trip with a person fully able to portray the objective beauty of the sights, as