Kingdom, the E is the standard orchestral tuba. The euphonium is sometimes referred to as a tenor tuba and is pitched in B, one octave higher than the BB contrabass tuba. The term "tenor tuba" is often used more specifically to refer to B 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 tubas exist but are extremely rare (there are at least four known examples). The first two were built by Gustave Besson in BBB, one octave below the BB contrabass tuba, on the suggestion of John Philip Sousa. The monster instruments were not completed until just after Sousa's death. Later, in the 1950s, British musician Gerard Hoffnung commissioned the London firm of Paxman to create a subcontrabass tuba in EEE for use in his comedic music festivals. Also, a tuba pitched in FFF was made in Kraslice by Bohland & Fuchs probably during 1910 or 1911 and was destined for the World Exhibition in New York in 1913. Two players are needed; one to operate the valves and one to blow into the mouthpiece. Size vs. pitch In addition to the length of the instrument, which dictates the fundamental pitch, tubas also vary in overall width of the tubing sections. Tuba sizes are usually denoted by a quarter system, with designating a normal, full-size tuba. Larger rotary instruments are known as kaisertubas and are often denoted . Larger piston tubas, particularly those with front action, are sometimes known as grand orchestral tubas (examples: the Conn 36J Orchestra Grand Bass from the 1930s, and the current model Hirsbrunner HB-50 Grand Orchestral, which is a replica of the large York tubas owned by the Chicago Symphony Orchestra). Grand orchestral tubas are generally described as tubas. Smaller instruments may be described as instruments. No standards exist for these designations, and their use is up to manufacturers who usually use them