The largest brass instrument is the tuba. It is also the lowest in pitch. Because of its low tone, the tuba serves as the bass in the brass section of orchestras and other musical groups.
Tubas are featured in many styles of music, from marching bands to classical orchestras. The sousaphone is another large brass instrument that is closely related to the tuba, but it is more commonly used in marching bands. In 2013, the largest playable tuba and largest brass instrument in the world was displayed at the Musikmesse music trade fair in Frankfurt, Germany. Nearly 8 feet tall, the instrument was almost double the size of a conventional tuba.