Choir III Chamber Choir is the pinnacle treble ensemble of the award-winning Bach Children's Chorus with a focus on performing challenging a capella choral music and accompanied pieces in three or more parts, including premiering new Canadian works. Chamber Choir singers are active participants in Choir III and are expected to take on important leadership roles with Choir II and Choir III Cantabile.

Weekly music homework assignments help each singer build skills and confidence and are mandatory for all choristers to accomplish. Choir III emphasizes performance excellence through choral music.