Jimmy Fallon revived the barbershop quartet last night for a rousing rendition of R. Kelly's time-honored party anthem "Ignition" (Remix) live on The Tonight Show. Fallon and The Ragtime Gals delivered their take on the bottle popping classic with a display of harmonic dexterity that was just as impressive as their tri-colored blazers. Their set would surely have made the Be Sharps proud. The performance last night follows Fallon and The Roots' transition to The Tonight Show on Monday. Check the footage below to watch Jimmy Fallon and The Ragtime Gals perform their barbershop quartet cover of "Ignition." Stay tuned for more from The Tonight Show starring Jimmy Fallon.