Bon Jovi’s David Bryan Grabs the Mic for ‘Livin’ On a Prayer’ and Other Hits at Club

[[tmz:video id=”1_uohc43ki”]] If Jon Bon Jovi’s voice ever craps out, we found the perfect stand-in … a guy who already knows all the lyrics, and is usually just a few feet away onstage — his keyboardist, David Bryan! David walked into the Casa…

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