A rare cassette recording of John Lennon and Yoko Ono will be auctioned in the Danish capital Copenhagen on Tuesday, the BBC reports.
The 33-minute audio track was made by four Danish teenagers more than 50 years ago, and just months before The Beatles announced their break up.
It features an interview with the couple and what is believed to be a never-released song.
The auction house selling it estimates it could fetch between $32,000-50,000 and is likely to go to a museum or collector.
In January 1970 a group of schoolboys set out to meet the iconic musician and interview him for their school newspaper.
“We were a bunch of 16 year old hippies,” says Karsten Hoejen, who made the recording. They were mostly interested in Lennon and Ono’s peace campaigns, he says.
Locals had been surprised to discover the stars were staying in Thy, in the far northwest of Denmark.
The pair had come to spend time with Ono’s young daughter Kyoko, who was living in the area with her father, ex-husband Anthony Cox and his wife Melinda.
Initially the stay went largely unnoticed. But once word got around, a news conference was held.
The four teenagers persuaded a teacher to let them attend and negotiated a ride to the venue, but they were delayed by a snowstorm and missed the event.
“It took a long time because of the snow and icy roads,” recalls Mr Hoejen. “As we arrived everyone was leaving,”
However the boys and a few other late journalists were invited in anyway.