Created in 1940 by Warren Hunke, Class of 1942, the Octet is perhaps the oldest a cappella group at Williams. The Octet, also once known as "The Ocho", performed from 1941 to 1955, and then disbanded for a while. 1976 saw the reappearance of the Octet, a year after the reunion concert of the Octet Alumni in 1975.
The all-male Octet has grown from eight members to fifteen over the course of the years. They sing various genres at their concerts, and usually perform one small and one large concert on the Williams campus, and sing at other colleges approximately ten times a year. They have performed in locations such as the D.C. subway, Six Flags, and Central Park.
The Octet Alumni perform once a year at reunion concerts, usually in November around Homecoming. The group comprises alumni from all years.