What is sub contra bass tuba?

The subcontra bass tuba is the largest and lowest pitched instrument in the tuba family. It is also referred to as the "octo-contra" or "sub-contrabass" tuba. It is typically pitched in BBb or CC, an octave lower than the bass tuba.

The subcontra bass tuba is often utilized in large ensembles, such as orchestras and bands, for its ability to produce a deep, rich sound that can fill a room with its low frequency resonance. It is also sometimes used in experimental music and avant-garde compositions for its unique tonal qualities.

Due to its large size and weight, the subcontra bass tuba is often played while seated. It is typically made of brass with a large, flared bell and valves to control the pitch and range. It can measure up to 9 feet in length and weigh over 50 pounds. Playing the instrument requires careful management of breath and air pressure due to the resistance of its large size and low pitch.