The G-A Blue Devil Marching Band brings together brass and wind players, percussion, and Color Guard to create an exciting and dynamic field show each season. The program combines music and visual performance, with multiple sections of music set to movement, choreography, marching drill, props, and Color Guard equipment.

The marching season begins with Band Camp in July and continues through Championships the first weekend in November. The band performs in support of the G-A football team on Friday nights and travels to compete in Cavalcade of Bands competitions on Saturdays throughout the season.

The Color Guard consists of students in grades 9–12 and adds movement, visual storytelling, and equipment work to enhance each production.

With a long-standing history in the competitive marching circuit and numerous championship wins, the G-A Blue Devil Marching Band continues a tradition of excellence, dedication, teamwork, and school pride both on and off the field.