The Instrumental Music Program runs a number of after school hours extension ensembles for public school students. With the exception of the ACT Chorale, all of the below ensembles are audition based in 2025.
- ACT Percussion Ensemble - Years 7 - 12 students in ACT public schools
- ACT Young Voices (Formerly Primary Concert Choir) - Years 4 - 7 students in ACT public schools
- ACT Chorale (Formerly Senior Concert Choir) - Years 8 - 12 students in ACT public schools
- ACT Primary Concert Band - Year 6 students enrolled in IMP classes
- ACT Junior Concert Band - Years 7 & 8 students in ACT public schools
- ACT Senior Concert Band - Years 9 - 12 students in ACT public schools
- ACT Jazz Band - Years 9 - 12 students in ACT public schools