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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.
This instrument was soon adopted by British brass bands. Tubas come in a number of keys: BB flat, CC, E flat, F, and GG, though the tuba is what is called a non-transposing instrument, as its music is read and played in concert pitch. There are many design configurations for the tuba.