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'Bang, Bang!' Brian Williams and Lester Holt Cover 'Rapper's Delight'

<p>Jimmy Fallon and his "Tonight Show" crew have turned the 'Nightly' anchor into a rapper once again. Learn how they do it.</p>

Jimmy Fallon and his staff at "The Tonight Show" have turned Brian Williams into a rapper once again -- and this time, they've added Lester Holt to the mix. How do they do it? Jimmy breaks it down for Brian Williams.