
Pete McCluskey was a member of the band called the Strougers, and they were opening for U2 at the Danelion Market, a venue which no longer exists, in 1979 in the band's hometown of Dublin. For whatever reason, McCluskey decided to record U2's set, and those bootleg recordings were just recently uncovered.
From the setlist, you can see a few songs U2 would come to be known for, including "Out Of Control” and “Shadows And Tall Trees." However, these recordings are of a couple of unfamiliar tracks, "In Your Hand," and "Concentration Camp." These are thought to be the only live recordings of these songs to be in existence.
Hopefully one day, we'll be able to listen to the entire recording!
Via Stereogum