This page lists all of the instruments found in a marching band based on what section they are in.
Woodwinds: Made up of flutes and reed instruments such as clarinets, tenor & alto saxophones, piccolos and bass clarinets.
Brass: Consist of instruments that have valves and slides. The instruments usually found in this section in a marching band are Trombone, baritone, mellophone (french horn), trumpet, sousaphone and tuba.
Percussion (aka. The battery): The percussion are the drum section of the band, but they are a lot more than just drums. A marching band percussion section consists of snare drums, tenor drums, bass drums, and cymbals.
Front ensemble (the pit): The pit is the stationary percussion ensemble. In a marching band front ensemble you can usually find a timpani, tam-tam, vibraphone, marimba, xylophone and a concert bass drum.