Question

What is the lowest sounding brass instrument?

Answer 1

Tuba:  This is the lowest sounding brass instrument.  It is also the largest member of the brass family.  The tuba uses valves and its cup-shaped mouthpiece to change pitches.  It sits in the back of the orchestra.  A cousin of the tuba is the sousaphone, which is a tuba with a different shape.  The sousaphone is used for parades and was invented for John Philip Sousa

Answer 2

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tuba

tubaThe tuba is the largest and lowest brass instrument and anchors the harmony not only of the brass family but the whole orchestra with its deep rich sound.