The Show Choir is one of Donovan Catholic's three vocal groups (along with the Jazz Choir and Classical Choir). It is nicknamed "The Big Blue Singing Crew," and it performs at a variety of festivals, concerts, and competitions. It also sings at school functions, including Masses and the annual Christmas Concert. Every year, the choirs and band travel to a national competition. They have competed in Virginia Beach, Washington, D.C., Boston, and other major cities, and received many awards.

Show Choir is also the name of an after-school class, and credits earned count toward students' GPAs. Classes were held in the Band Room prior to 2003, but are now held in the music trailer. The director and teacher of Show Choir is Ms. Cynthia Wald-Hardyal.