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.
'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>