A Dictionary of Music and Musicians/Althorn
ALTHORN, an instrument of the Saxhorn family, usually standing in E♭ or F. It is exclusively used in military music, and often replaces the French horn, for which however it is a poor substitute as regards tone. It is much easier to learn than the horn, and presents greater facility in rapid melodic passages. The least objectionable way of introducing it into the reed band is to associate a pair of these instruments with two French horns, reserving characteristic holding notes for the latter. In the brass band, where variety of timbre is less attainable, it answers its purpose well, and can better be played on horseback, from its upright bell. The name is also given to the saxhorn in B♭, but this is best distinguished as the Baritone. The scale and compass of this and the other Saxhorns are given under that word.
[ W. H. S. ]