Comments: U2 participates in a BBC Radio Wales concert celebrating the 30th anniversary of The Alarm's album, Declaration. While the event is being taped, the band appears on a pre-recorded video singing "Happy Birthday" while Edge plays an acoustic guitar. Bono then delivers a short message to The Alarm's Mike Peters and, when he's done, the band starts singing The Alarm's "Blaze Of Glory."

We don't know where U2's performance was recorded; it may not even have been in Dublin. We also don't know the exact date, but April 11 is the date that the video was shown during the BBC Radio Wales recording. The whole thing airs on April 25th.