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The Wagner tuba is a narrow-bore tuba with a French-horn mouthpiece. Tubas appeared first in Berlin in the 1820s, soon after the invention of the valve. They were soon accepted into the band and orchestra, displacing the serpent, ophicleide, and other such instruments of poorer tone quality and intonation.
The Wagner tuba is a rare brass instrument that is essentially a horn modified to have a larger bell throat and a vertical bell. Despite its name, it is generally not considered part of the tuba family.he French horn, like the German and Vienna horns, is usually referred to simply as the horn. The bore of the French horn is small, between 10.8 and 11 mm, compared to 11.5 mm for the German horn, but not as small as the Vienna horn at 10.7 mm.