Tuba and Sousaphone
These three big guys are all essentially the same instrument. The tuba is the lowest of the brass and usually takes the bass line in a marching band. But since a traditional tuba is pretty bulky and heavy, the Sousaphone was invented by John Philip Sousa - the March King. This "wearble" tuba is carried on the shoulders and makes marching a bit easier, but the brass model is still pretty heavy. So the Souasphone has been recreated in light durable ABS resin - a very popular polymer for construction of musical instruments. The ABS model doesn't have quite the same penetrating "brass" sound as the original, but it works well and is very popular with marching tuba players.
