The term 'March Sound' can be broken down into four crossword solutions: FOOTSTEP (8 letters), TUBA (4 letters), Hup (3 letters), and TRAMP (5 letters). Footsteps are the sound of someone walking, usually heard as a rhythmic pattern. The TUBA is a large brass instrument that produces a deep, low-pitched sound. Hup is an exclamation used to encourage or motivate someone to do something. Finally, TRAMP is a slang term for a person who travels from place to place without a permanent home or job. Together, these four words create a vivid image of a marching band, with the footsteps of the musicians, the deep sound of the TUBA, the encouraging hups of the conductor, and the tramping of the feet.