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. A distinctive factor of the quartet is tenor Tim Waurick's ability to sustain notes for upwards of 30 seconds, and the tenor's and lead's incredibly high note range, featured in many of the group's recordings and live shows.

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