Call the NBC studios at (212) 664-3056. A recorded prompt will instruct you to press 3 for tickets to Fallon's show. If tickets are available, an operator will answer the call to book tickets for the show. If they are not, a recorded message will explain when tickets will become available again.
Go to the Late Night website at latenightwithjimmyfallon.com/band-bench/ to register for tickets to be on stage with the musical guest. These viewers sit in the back of the audience, in a section called the "Band Bench," during most of the show. They move to the stage for the musical guest performance. Fill out the required contact information and submit the form online.
Go to NBC Studios on the day of the taping for possible stand-by tickets Starting at 9 a.m., one ticket per person will be handed out under the NBC marquee on 49th Street. The tickets will be given out until there are either no more left or everyone in line has one. The NBC tour ticket booth in the NBC store will hold any remaining tickets until the show begins.