Jimmy Fallon, Meghan Trainor & The Roots Sing "All About That Bass" (w/ Classroom Instruments)
Meghan Trainor stops by the Tonight Show Music Room to perform "All About That Bass." Jimmy Fallon - wood block, bass drum, Casio keyboard Meghan Trainor - vocals, triangle Questlove - hand clappers Mark Kelley - kazoo Kamal Gray - xylophone James
