The legendary singer-songwriter stopped by the “Tonight Show” on Thursday and was introduced to a vocal-looping app on Fallon’s iPad.
The late-night host crooned a few riffs in different octaves and created a make-shift a cappella group with the Piano Man.
Joel chimed in with his soulful pipes and soon the entire room was brimming with jungle-like rhythms.
The Roots added some playful percussion and the audience excitedly clapped along to the performance.
Watch Fallon and Joel’s performance below: