The Roots cannot be in two places at once, and as such, while The Tonight Show house band journeyed to Los Angeles for tomorrow night’s Grammys ceremony, former Letterman bandleader Paul Shaffer stepped in for one night only on Friday to help out Jimmy Fallon. “It’s such a coincidence we’re here tonight because 41 years ago this very week was when David Letterman came on the air right across the hall here at NBC… so this is like our 41st anniversary,” Shaffer told Fallon.