Hey, Kids, It's a Tuba
The Tuba is the largest and lowest sounding member of the brass family. Its sound is very round and mellow. The tuba, along with the string basses and bassoons, provide the lowest sounds for the orchestra.
1) The C tuba is the most commonly used tuba in the United States symphony orchestras because of its ability to play in tune with the other instruments of the orchestra.
2) The Bb tuba is the most common instrument of tuba among players in German, Austrian and Russian orchestras. It is also the most common instrument for student tuba players.
3) The Sousaphone, invented by John Phillip Sousa, is the modern version of the helicon. Both instruments are designed to make the instrument easy to carry, and to project the sound toward the audience.