The trio came together for a "classroom instruments" performance, reported Aceshowbiz.
While the 27-year-old star was on the vocals, Fallon and the members of The Roots played the wood block, ukulele, rainbow-colored xylophone, tambourine and banana shaker.
At one point, Adele grabbed a fake flip phone and jokingly sang through it.
She stopped by "The Tonight Show" to promote her comeback album "25".
Released last Friday, it has just destroyed the first-week sales record set by NSYNC's "No Strings Attached" 15 years ago.
Marking her first full-length in four years, "25" is predicted to debut on Billboard 200's Number 1 next week with around 3 million sold.
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