The lowest of the brass instruments is the Foundation of the copper group, like the double bass, the strings, the tuba was invented in 1835. The range is from mi contra to the FA of the first octave, voice harsh, massive.
As a rule, the role of the tuba in the orchestra is limited to the execution, an octave lower, third party trombone (usually in the orchestra consists of three trombones and tuba). Sometimes her writing and independent bass line. Solo passages of the tubes are extremely rare. One of them is the melody in the play "Redneck" from "Pictures at an exhibition" by Mussorgsky orchestrated by the French composer Ravel.