Bass horn for brass music.

When the orchestra became a wind band independently, only the bass horn and trombone were left in the bass part, so the harmony of the bass was not perfect. So people wanted to invent another bass instrument. At that time, people wanted to see if an instrument could be invented to replace the cello. Moreover, some people want to say that since we want to invent a bass instrument, we should simply invent it in the shape of a bass horn, so we invented the upper bass horn, which sounds similar to the French horn in the high-pitched range. Therefore, when the French horn replaces the string part of the wind band, the upper and lower horns can also replace the French horn, because the upper and lower horns also play two important roles.