The term 'Bass in a Band' can be summarized as the job of playing the TUBA in a musical ensemble. The TUBA is a large, low-pitched brass instrument that is often used to provide a strong bass line in a band or orchestra. It is usually played with a mouthpiece and has valves that allow the player to change the pitch of the notes they are playing. The TUBA is an important part of any musical ensemble, providing a strong foundation for the other instruments to build upon.