This is a video from the Pentatonix show at the Peabody Opera House in St. Louis, MO on March 19, 2014. About halfway through the show all of the microphones stopped transmitting. After a few awkward minutes dancing half-heartedly and talking to the first few rows, they decided to try and sing "Run to You" with no mics while the stagehands fixed the problem.
I'm sorry for how quiet it is, I was seated all the way up in the mezzanine.
