As first reported on Friday, Jay-Z’s plans to perform on top of the marquee of the Ed Sullivan Theater for his performance on Late Show With David Letterman were nixed by the city of New York. But what first seemed like a cancelled performance evolved to one on the building’s rooftop—alongside Eminem.

On Sunday, the day before the performance, Em posted on his twitter that the first 50 fans who emailed—and were at least 25 years old, with valid ID—would win passes to the event. Hov’s Facebook page posted a similar message.

“I got the first email, but I didn’t get the second one,” said one fan while waiting in line, nervously.

“I sat down at my computer and it was posted 23 seconds earlier, so I emailed right away,” boasted another excited fan.

Em, whose latest album, Recovery, dropped yesterday, was also in town for the first leg of Red Bull EmSee: The Road to 8 Mile. Held at the Bowery Ballroom, those who attended the competition also got the chance to see Slim spit a recent freestyle and some tracks from his new album.

Yesterday’s rooftop performance will appear Late Show this Friday. —Adam Fleischer