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Pentatonix at Fox Theatre

Avi Kaplan of Pentatonix performs for a sold-out crowd at the Fox Theatre in St. Louis on Thursday, Aug. 31, 2017. Photo by Jon Gitchoff

When 8 p.m. Monday • Where The Ready Room, 4195 Manchester Avenue • How much $17-$20 • More info eventbrite.com

Right after Pentatonix’s recent concert at Hollywood Casino Amphitheatre comes this: a show by former Pentatonix singer Avi Kaplan. He left the a cappella group in 2017 and has been doing his own thing ever since. By Kevin C. Johnson