It took over an hour for the sound check. Now you've got a full house enraptured by your music. You're going full throttle, the audience is totally with you, and then-- No amplification. Nada.
I present to you two performances I captured, and consider myself fortunate to have done so. In each case, the artists hardly missed a beat, and not only carried the show, but got the audience screaming for more.
Also read: Delicate Steve: Tiny Desk Concert