(The fourth song was Grow Old With Me.)
The four demos were recorded on a boombox by Lennon, playing piano, in his Dakota apartment.
In 1978, Lennon had temporarily retired from the music business to raise son Sean.
The Beatles 19691969 Paul McCartney / Photographer: Linda McCartney
He famously called the era his househusband period.
McCartney used the process on his recent tour, allowing him to sing a duet with Lennon.
We had Johns voice and a piano and he could separate them with AI.
They tell the machine, Thats the voice.
This is a guitar.
Then we can mix the record, as you would normally do.
So it gives you some sort of leeway.
Despite his use of the technology, McCartney conceded that the technology raises concerns.
Its kind of scary but exciting, because its the future.
Well just have to see where that leads.
