Meghan Trainor Performs 'All About That Bass' with Classroom Instruments on 'Tonight Show'

No matter how you perform it, Meghan Trainor's "All About That Bass" is super catchy.

The 20-year-old singer/songwriter showed up on Thursday's Tonight Show to perform a special rendition of her hit alongside host Jimmy Fallon and The Roots using only classroom instruments.

VIDEO: "All About That Bass" Goes Acoustic

This isn't the first time we've seen The Roots using plastic clapping hands. Fallon and the Tonight Show gang has performed a lot of catchy tunes this way, including Idina Menzel's "Let It Go," Robin Thicke's "Blurred Lines" and Mariah Carey's "All I Want For Christmas Is You."

What do you think of this version of "All About That Bass"? Play music critic in the comments and tweet #ETnow.

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It seems nearly every day Fallon has another video going viral. ET uncovers his secret to success: