The RHS Concert Band consists of about 25 instrumentalists and is open to students who began playing prior to their time at RHS. Consisting of woodwinds, brass, string basses, and percussion, the ensemble peforms 2-3 concerts per semester in the Layman Auditorium. The band annually travels to District V Concert Assessment to receive a rating from an esteemed panel of adjudicators. Members also have the opportunity to audition for and represent RHS in various honor bands. 

The RHS Marching Band is an outdoor competitive performing ensemble made up of 8th-12th graders. Most members have been playing their instrument/spinning for at least two years prior to joining. The group consists of winds, percussion (drumline & front ensemble), and colorguard members. The Marching Gladiators regularly meet from July through November, building up a full field show, performing at football games and competitions, and frequently representing Riverheads HS.

The RHS Jazz Band meets on Thursday afternoons during the Spring semester to prepare for a few concerts throughout the middle of the calendar year. The ensemble performs at the RHS Spring Concert, Band Banquet, District V Jazz Assessment, and the Fall Gladiator Gala. Students may also choose to audition for the District V Jazz Honor Band.