What orchestras feature a sousaphone?

Answer 1

The sousaphone goes under brass instruments. These are big instruments that you hold over your entire body, and it goes over your left shoulder. This instrument is named after John Phillip Sousa.

Answer 2

Orchestras do not feature sousaphones as they are impractical in the traditional setting. While originally a concert instrument, sousaphones are most commonly seen in Marching Bands due to it's easier execution of marching compared to a concert tuba.