Meghan Trainor sings 'All About That Bass' with Classroom Instruments on Tonight Show (VIDEO)

Meghan Trainor sang her hit song 'All About That Bass' on The Tonight Show starring Jimmy Fallon with The Roots and classroom instruments. Amaze, amaze, amaze.

I love this so much.

The classroom instrument segment on this show is just magic. Go Meghan and Jimmy!

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 Poyser - melodica Captain Kirk - ukulele Frank Knuckles - bongos Tuba Gooding Jr. - kazoo, apple shaker, banana shaker Black Thought -- tambourine