Bethany High has an extremely well trained Brass band. Training to the band group is provided by a Band Major, a professional trainer .
Senior School Band is trained by Ex-Sergeant Denzil Patterson of Indian Air-Force.
Junior School Bandis trained by Mr. Gavin Patterson. A select group of children from classes IV to XI constitutes the school band. They are professionally trained to perform for the following events: 'In Threes Marching', a quick drill march, besides being trained in 'Circle Marching', 'Bugler & Drummer Group Marching', 'Group Cover Marching', 'Figure Eight Marching', 'Square Marching', etc. The School Band displays its prowess on important occasions like the Independence Day, Republic Day , Sports Day and Founders Day. The marching contingent has won many laurels on such occasions. In the near future the band will be launched for Inter School competitions and displays during Independence Day and Republic Day celebrations in Delhi.