Demand has been so strong for "Unwigged and Unplugged," the concert tour featuring Christopher Guest, Harry Shearer and Michael McKean performing songs from both This is Spinal Tap and A Mighty Wind, that they've added a second date to their upcoming NYC appearances May 26-27 at the Beacon Theatre. Tickets go on sale Friday for the second NYC show, but are available for most other Unwigged and Unplugged concerts across North America, which begins April 17 in Vancouver, British Columbia, and runs through the end of May.

The trio will appear tonight on MSNBC's Countdown with Keith Olbermann, too. Here is a clip of them talking about their tour from the April 1 edition of The Tonight Show with Jay Leno:

After the jump, a longer teaser of the trio performing a medley of their hits live in concert at the press conference announcing their tour plans…


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