The Klaxophone is a musical instrument created by American composer Henry Fillmore. Made of twelve car horns, it was created for use in his march The Klaxon: March of the Automobiles, which was composed in 1929 for the 1930 Cincinnati Automobile Show.^[1] This piece featured the instrument mounted onto a table and powered by a car battery.^[2]

The Klaxophone is a brace of noisy devices tuned to play along with the band, presumably in the Trio and Break strain.^[3]