Assumption Rayong Symphonic Band was founded in 2004 and revitalized in 2024 under the direction of Bro. Dr. Seksan Sakonthawat. The ensemble is committed to musical excellence while fostering discipline, responsibility, and collaboration. It performs regularly at school ceremonies, liturgical celebrations, and special events, and serves the wider community through music. Inspired by the spirit of Saint Louis-Marie Grignion de Montfort, students are nurtured as “servant leaders” with humility and dedication. With strong institutional support, the band continues to pursue artistic growth and holistic development.