A Harmony Brigade rally is a weekend event for skilled quartet singers who are ready to learn challenging songs and have fun. The music is advanced and may be difficult for less experienced singers. This is not a chorus event. Five months before the rally, participants get the music and a CD to help them learn the songs. Quartets are randomly assigned at the rally, and each member must know their part without extra practice.

Each Brigade ensures that members can practice together before the rally weekend, usually holding at least three practice sessions in their areas. The weekend focuses on quartets, and everyone is encouraged to sing with different attendees. There’s a fun contest with randomly assigned quartets judged by a celebrity panel. A Saturday night show features a special quartet, selected quartets from the rally, and the full group singing all the songs.

First-time attendees receive support and tips from veterans to enhance their experience.