Hornophone

The horns are tuned to the notes of a chromatic scale and arranged so that the bulbs form a musical keyboard, much like the bars of a xylophone or glockenspiel.

For his 1929 piece March of the Automobiles, American composer Henry Fillmore invented the similar klaxophone, built from 12 tuned klaxons.

In the 1940s and 50s, band leader and drummer Spike Jones used many unusual instruments for comic effect, including sets of tuned car horns.

[1] Hungarian composer György Ligeti later included a chromatic set of 12 bulb horns in his 1977 opera, Le Grand Macabre.

[2] In the 21st century, the hornophone continues to appear mainly in musical comedy acts, notably by British comedians Harry Hill, Nutty Noah, and Bill Bailey.