Last fall U2 was getting set for a week-long stand performing on The Tonight Show Starring Jimmy Fallon, but those plans were derailed after Bono suffered injuries from a cycling accident in New York’s Central Park.

With Bono’s health having improved recently, the band had been taping segments for a U2-centric episode of The Tonight Show which aired last friday. They were first spotted at a seemingly impromptu busking session in Grand Central station, wearing disguises, performing “Angel Of Harlem” to a small crowd. Onlookers captured the moment on social media:

Unbelievable! U2/Jimmy Fallon performing at Grand Central #onlyinnewyork #grateful #jimmyfallon #u2

A video posted by Regine (@regineem) on May 4, 2015 at 6:57pm PDT

#U2 at #GrandCentral via @dreyarchives ・・・ you know. front row at a secret U2 concert in grand central terminal thanks to Jimmy Fallon! #U2 #bono #theedge #jimmyfallon #tonightshow #grandcentral #nyc #livemusic

A photo posted by U2News (@u2news) on May 4, 2015 at 8:20pm PDT

Watch the highlights from the all-U2 episode of Fallon below: