Meghan Trainor, Jimmy Fallon and The Roots Tackle 'All About That Bass' on 'The Tonight Show' with Kiddie Instruments [WATCH]

Meghan Trainor may be "All About That Bass," but last night (Sept. 4) on The Tonight Show Starring Jimmy Fallon, the rising body positive pop star was all about the classroom instruments! Joining the likes of Idina Menzel, Mariah Carey and Carly Rae Jepsen, Trainor appeared on The Tonight Show last night alongside Fallon and The Roots to do a kiddie play on her No. 2 hit, and it's just as much fun was one would expect.

Armed with a woodblock, some plastic clappy things, a little xylophone, maracas, a tiny guitar, a triangle and more, Trainor and co. sing along to the catchy throwback anthem all with flawless vocals, plenty of fun and smiles on their faces.

Because how can you be sad when you're holding a triangle?

Watch Meghan Trainor, Jimmy Fallon and The Roots tackle "All About That Bass" with classroom instruments below:

"All About That Bass" is Meghan Trainor's debut single, though she's also rolling out new music. This week, she debuted two new tracks, "Dear Future Husband" and "Title."

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Meghan Trainor, The Roots