Noun
Vienna horn (plural Vienna horns)
(music) A brass aerophone used mainly in Austria in the performance of orchestral and classical music.
Although instead of the full range of keys, Vienna horn players usually use an F crook and it is looked down upon to use others, though switching to an A or B crook for higher pitched music does happen on occasion. Source: Internet
Related horns main The variety in horn history necessitates consideration of the natural horn, Vienna horn, mellophone, marching horn, and Wagner tuba. Source: Internet
In addition, the single B horns are sometimes used in solo and chamber performances and the single F survives orchestrally as the Vienna horn. Source: Internet