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.

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