Sir Paul McCartney has revealed that he used artificial intelligence (AI) to assist in the creation of "the final Beatles record."

He told BBC Radio 4's Today show that the technique was used to "extricate" John Lennon's voice from an old tape so he could finish the song, reports BBC.

"We just finished it up and it'll be released this year," he explained.

McCartney did not name the song, although it is most likely “Now And Then,” a 1978 Lennon tune.

It was suggested as a possible “reunion song” for the Beatles in 1995, while they were putting together their career-spanning Anthology series.

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Yoko Ono, John Lennon's widow, had given McCartney the demo a year before. It was one of several songs on a tape titled “For Paul” produced by John Lennon shortly before his death in 1980, said the report.

The tunes, which are lo-fi and embryonic, were mostly recorded onto a boombox while the musician sat at a piano in his New York residence.

Two of those songs, “Free As A Bird” and “Real Love,” were finished and released in 1995 and 1996, respectively, by producer Jeff Lynne, marking the Beatles' first “new” work in 25 years.

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The band also attempted to record “Now And Then,” an apologetic love song typical of John Lennon's later career, but the session was short-lived.

"It was one day - one afternoon, really - messing with it," Lynne recalled.

"The song had a chorus but is almost totally lacking in verses. We did the backing track, a rough go that we really didn't finish."

Later, McCartney stated that George Harrison refused to work on the song because the sound quality of Lennon's singing was "rubbish."

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"It didn't have a very good title, it needed a bit of reworking, but it had a beautiful verse and it had John singing it," he told Q Magazine.

"[But] George didn't like it. The Beatles being a democracy, we didn't do it."

There were also said to have been technical issues with the original recording, which featured a persistent "buzz" from the electricity circuits in Lennon's apartment.

A bootleg CD containing a fresh version of the demo without the background noise was published in 2009. Fans have theorized that this recording may not have been available in 1995, implying that it was stolen from his residence after his death, along with other personal things.

Sir Paul McCartney has regularly stated his wish to complete the Beatles song in the ensuing years.