A rare audio recording of famed artist and peace activist John Lennon is to go on sale in Denmark on Tuesday. The recording has been privately held for fifty years, by the people who made it. Like many collectibles, this one has an interesting history. In 1970, four Danish teenagers got to meet privately with British musician and Beatles member John Lennon. They planned to write a story about him for publication in their school’s magazine. The boys made a sound recording of the event. Now, 50 years later, the Danes are putting the 33-minute-long recording up for sale. Included with it are 23 pictures taken by the students and a copy of the magazine in which the story appeared. Bidding for the set is to open September 28 at the Danish auction business Bruun Rasmussen. The 16-year-olds were not star-struck when they questioned Lennon that January day in the area of Thy. It was the height of the Vietnam War and the Cold War. Lennon and his wife, artist Yoko Ono, were opponents of both conflicts. Karsten Hoejen remembers the two had “a message of peace, and that was what was important to us.” He recorded the meeting with equipment he borrowed from the local record store.