Sweet Sixteen is an extracurricular vocal performing group chosen by audition from members of the SGHS Choir. Sweet Sixteen rehearses one evening each week and usually gives at least a dozen performances per year. Many of these performances are at local civic events, but some performances require the group to travel out of town.

Rehearsals are usually held at 7:00 pm each Tuesday. Auditions occur at the beginning of September every year. To audition, you must be enrolled in the choir for at least one semester of that school year. Auditions test vocal range, quality, ability to sing on pitch and in tune, ability to sing harmony while another part is being sung, and ability to accurately read and sing music at first sight.