LONDON (AP) — Artificial intelligence has been used to extract John Lennon's voice from an old demo to create "the last Beatles record," Paul McCartney said Tuesday.

McCartney, 80, told the BBC that the technology was used to separate the Beatles' voices from background sounds during the making of director Peter Jackson's 2021 documentary series, "The Beatles: Get Back." The new song is set to be released later this year, he said.

Jackson was "able to extricate John's voice from a ropey little bit of cassette and a piano," McCartney told BBC radio. "He could separate them with AI, he'd tell the machine 'That's a voice, this is a guitar, lose the guitar'."

"So when we came to make what will be the last Beatles record, it was a demo that John had that we worked on," he added. "We were able to take John's voice and get it pure through this AI so then we could mix the record as you would do. It gives you some sort of leeway."

McCartney described AI technology as "kind of scary but exciting," adding: "We will just have to see where that leads."

The same technology enabled McCartney to "duet" virtually with Lennon, who was murdered in 1980, on "I've Got a Feeling" last year at Glastonbury Festival.

The singer-songwriter is set to open an exhibition later this month at the National Portrait Gallery featuring previously unseen photographs he took during the early days of The Beatles as the band rose to worldwide fame.

The exhibition, titled "Eye of the Storm," showcases more than 250 photos McCartney took on his camera between 1963 and 1964 — including portraits of Ringo Starr, George Harrison and Lennon, as well as Beatles manager Brian Epstein.