The sousaphone's bell faces forward Tubas are brass instruments with the lowest tonal range, but they have slight variations. In addition to different possible structures, the four main pitches are F, Eb, C, and Bb. The baritone, euphonium, and sousaphone are also companions of the tuba. The sousaphone was created by redesigning the tuba to a larger size. sousaphone are also companions of the tuba Plays in key of BB John Philip Sousa, the famous American conductor, and composer of many marching tunes came up with the idea for the sousaphone. An instrument manufacturer completed it as a special. The sousaphone looks truly heavy. When constructed out of brass, it can weigh about 12.5 kilograms. ABS resin material brings the weight down to 3 kilograms. The Blue Bells of Scotland The Blue Bells of Scotland The sousaphone's prominent feature is the large bell that sits over the player's right shoulder and faces forward, which allows the instrument to project its sound toward the front. The large, round bell is often a symbolic feature of marching bands and other troupes that line up and play information.