After being photographed without his cast Wednesday, the comedian joined Bono on stage for a harmonica solo that night – a sure sign that his recovery from a serious hand injury is going smoothly.
Fallon, 40, played along to U2's "Desire" during the band's concert at Madison Square Garden in New York – and Bono, 55, caught the whole performance on Meerkat. During U2's tour, the group brings one lucky fan on stage to stream the experience using the app. This time, though, Fallon got the honor. (Watch him play below.)
His musical streak didn't end there.
On Wednesday night's episode of The Tonight Show, Fallon was joined by surprise guest Chevy Chase, who offered a (literal) hand to perform a rendition of 'Heart and Soul.'
The Saturday Night Live alums – both nursing hand injuries – donned a single oversize tuxedo jacket between the two of them and went on to perform the classic piano duet.
The Tonight Show host was rushed to the hospital June 26 after tripping on a rug and catching his wedding ring on the side of a table in his Manhattan apartment.
"Almost ripped my finger off," he Tweeted after the accident.
When he returned to his hosting duties last week, the former Saturday Night Live funnyman revealed that he underwent a six-hours surgery and spent 10 days in the intensive care unit, predicting he'd be back to normal in eight weeks.
"This is the meaning of my life, I belong in TV, and I should be talking to people who are watching in an ICU or wherever you are, at home, if anyone's suffering at all, this is my job," he said. "I'm here to make you laugh."
And rock out with international rock stars.