If you ever needed proof that Zach Bryan was coming into his own, you now have it. Zach, who is known for bringing both singers and non-singing celebs on stage to join him for a few songs, topped himself Wednesday night with his biggest get yet. And to get this person on stage, it took some doing.

Just 48 hours after a show in San Diego and less than 24 hours before he was set to perform at San Francisco’s Chase Center, Bruce Springsteen flew all the way back to New York for a surprise performance at Zach’s concert at Brooklyn’s Barclays Center. Zach probably was fully aware the living legend would be stopping by, as he was rocking a Springsteen t-shirt during his performance.

The two joined forces on Zach’s unreleased song “Sandpaper” as well as his iconic show-closer, “Revival.” And proving that he’s human after all, Zach forgot the lyrics to his own song while playing alongside “The Boss.” Certainly understandable.

Source: Variety