In an era of social media snark, negative news and celebrity feuds, the 'Tonight Show' host seems practically counterculture on TV. "If they want to come on, my job is to make them look good."

Jimmy Fallon is ­frustrated, to the degree the famously unflappable Tonight Show host ever gets frustrated. In just a few hours, Justin Bieber is ­scheduled to take the stage at 30 Rock's Studio 6B. Earlier that morning, Fallon laid out the plan in a tweet to his 29.2 million Twitter followers: Bieber would "do something fun" and then play a song backed by Tonight Show house band The Roots.

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