Camerata Choir is highly select treble/bass ensemble.  This choir is comprised of students who are serious about the art of singing and choir, and who have a baseline understanding of music theory, vocal technique, and ensemble skills.  Many members of Camerata Choir take private lessons and all students have a diligent and regular practice routine outside of choral rehearsals in the classroom.  Camerata Choir participates in regional festivals, performs at school events, and often goes on tour in addition to the regularly scheduled home concerts.

Bel Canto is a highly select treble ensemble for students in grades 10-12.  This choir is comprised of students who are serious about the art of singing and choir, and who have a baseline understanding of music theory, vocal technique, and ensemble skills.  Many members of Bel Canto take private lessons and all students have a diligent and regular practice routine outside of choral rehearsals in the classroom.  Bel Canto participates in regional festivals, performs at school events, and often goes on tour in addition to the regularly scheduled home concerts.

Bella Voce Choir is an intermediate level treble choir for students in grades 10-12.  This choir is comprised of students who love to sing and love choir, and have the desire to further their understanding of music theory, vocal technique, and ensemble skills.  Some members of Bella Voce take private lessons and all members of Bella Voce practice their choral music outside of the school day.  Bella Voce participates in some regional festivals, performs at home concerts, and sometimes goes on a small tour during the school year.

Intermezzo is a treble/bass choir for students in grades 10-12.  This choir is comprised of students who love to sing and want to have an ensemble experience in high school without as many commitments outside the school day as the auditioned choirs.  Students with a wide range of musical backgrounds sing in Intermezzo and anyone who loves to sing is welcome to join! Intermezzo performs at three home concerts a year and participates in one regional festival. 

Concert Choir is Mount Si High School's freshman choir, open without audition to any freshman who loves to sing and would like to explore the art of choral music at the high school level.  In Concert Choir, students focus on ensemble musicianship, vocal technique, choral diction, music theory, and performance skills.  Concert Choir performs at three home concerts a year and goes on one day trip in the Spring.