Vocal Spectrum is a barbershop quartet from St. Charles, Missouri. In 2004, Vocal Spectrum won the Barbershop Harmony Society's International Collegiate Quartet Contest, and on July 8, 2006, they became International Champions, winning the society's International Quartet Contest. Vocal Spectrum began singing together in September of 2003. Each member of the quartet is a graduate of Lindenwood University in St. Charles. Each member is also a member of Ambassadors of Harmony, the International Chorus Champion of 2004. As of the 2006 International Quartet Contest, Vocal Spectrum is the only quartet in history to capture three of the four possible BHS gold medals (Collegiate quartet, Quartet, Chorus). The only championship left for Vocal Spectrum to win is the Barbershop Harmony Society's Senior quartet contest, for which they are not (yet) eligible.