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Pentatonix has the pipes, but pop stardom can be tricky
Pentatonix has the pipes, but pop stardom can be tricky

The a cappella group Pentatonix is built on the unaccompanied interplay of its five members' voices. But the most remarkable moment in the quintet's concert Monday night — and the most vivid demonstration of its improbable accomplishment — involved only one of those voices, in harmony with itself. The instrument in question belonged to Avi Kaplan, the group's resident bass as well as a man capable of producing two pitches at the same time. He showed off the technique (known as overtone singing) in a solo performance of a composition he called "The Dragon's Lullaby." A guttural drone accented by ghostly higher notes, the piece itself wasn't...

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