Valved horns were introduced in which century?

• A. 17th century
• B. 18th century
• C. 19th century
• D. 20th century

Answer: (C)

The idea being tested is when brass instruments like the horn gained the ability to play in all keys. Before valves, horns were natural instruments that could only easily produce notes from the natural harmonic series, with pitch adjustments limited to hand-stopping and changing crooks. That limited chromatic playing and key flexibility.

Valved horns were introduced in the 19th century. The first practical valve horn emerged in the early 1800s (developed by German makers such as Heinrich Stölzel and Friedrich Blümner), allowing players to change pitch by shortening the tubing with valves. This breakthrough made chromatic playing and playing in different keys practical, transforming brass performance and repertoire. By the mid to late 1800s, valve systems and horn design continued to improve and became standard, leading to the modern instrument we know today.

So the correct answer is the nineteenth century.