Tuba rotary-valved tubas pitched in the same octave as euphoniums. The "Small Swiss Tuba in C" is a tenor tuba pitched in C, and provided with 6 valves to make the lower notes in the orchestral repertoire possible. The French C tuba was the standard instrument in French orchestras until overtaken by F and C tubas since the Second World War. One popular example of the use of the French C tuba is the "Bydło" movement in Ravel's orchestration of Mussorgsky's "Pictures at an Exhibition", though the rest of the work is scored for this instrument as well. Larger BBB subcontrabass
Tuba The conical bore causes the instrument to produce a preponderance of even-order harmonics. A tuba with its tubing wrapped for placing the instrument on the player's lap is usually called a concert tuba or simply a tuba. Tubas with the bell pointing forward ("pavillon tournant") instead of upward are often called "recording tubas" because of their popularity in the early days of recorded music, as their sound could more easily be directed at the recording microphone. When wrapped to surround the body for cavalry bands on horseback or marching, it is traditionally known as a hélicon. The modern sousaphone, named