Thornton High School has two jazz bands. The Jazz Band is designed for students who either are learning about jazz completely or are still learning the basic theory and how to play jazz.

The Jazz Ensemble is the Top Music Group at Thornton High School. It features about 18 of the finest musicians. They have performed at many major festivals and even private functions. An Audition is held at the end of the year for spots the become available as seniors graduate.

The 2007 Thornton High School Jazz Ensemble at the UNC/Greeley Jazz Festival in April 2007