David Letterman Makes Shock Return to ‘The Tonight Show’ & Reunites With Paul Shaffer
Fallon was riffing with Paul Shaffer and the World’s Most Dangerous Band, Letterman’s longtime sidekick and band from his time hosting CBS’ Late Show from 1982 to 2015 — Shaffer and co were filling in for Fallon’s regular house band, The Roots, who are rehearsing for the upcoming Saturday Night Live 50th anniversary concert.