The Leominster High School jazz band is a premier ensemble with a long lasting legacy in performing. Alumni of this ensemble have gone on to be successful performers, composers and educators. The group strives in excellences across a wide range of styles including funk, R&B and rock.

The Leominster Marching Blue Devils is a cadet style marching ensemble known for their dance like movements. This driven group of musicians brings crowds to their feet at Friday night football games and steps on to competition fields with drive, energy and PRIDE. This group received a Bronze Medal at its last appearance at the MICCA Finals show, in 2019

After Hours is the high school garage band known for their conclusive performances at Icicle ball. The current line up is Thomas O'connor (Bass), Callie Nelson (lead guitar), Charlotte Weldon (Rhythm guitar), Mandie Leblanc (Keyboard and vocals) and George Ralston (Drum set)

A group of vocalists led by Arthur Pierce that perform at a variety of concerts and events.