First NBC Nightly News anchor Brian Williams spit hot fire when he rapped Dr. Dre and Snoop Dogg’s classic “Nuthin’ but a ‘G’ Thang.” Today B. Will digs deep in the crates and raps Warren G and Nate Dogg’s 1994 hip hop anthem “Regulate.” I love this bit so much, I really hope Jimmy Fallon continues to revive old school hip hop.