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Kelly Clarkson

Pentatonix likes the sound of a stadium tour

Television, YouTube, small theaters even the silver screen. That's where fans are accustomed to experiencing Pentatonix. Are they ready for the Grammy-winning a cappella quintet to perform in giant sports arenas? "It's definitely a different feel," said Pentatonix beatboxer Kevin Olusola, whose group opens for Kelly Clarkson on her current tour. "We're getting used to it. It's a different sound system, and a different way of playing. This is going to be our future." The biggest challenge is getting adjusted to the acoustics, which are very different from theaters. "With an arena, it sounds so big and full sometimes it can obstruct the way we...