The title is misleading. McCarney used machine learning to isolate Lennon’s vocals from a badly recorded demo tape - one that the group (largely at Harrison’s request) abandoned during their “Anthology” recording sessions.
Kind of melancholic as this will be the last Beatles song, and not even the entire group, as it was never fully worked on, I don’t know if there are guitar tracks by Harrison that could contribute to this song.
I consider myself more than moderately steeped in Beatles lore but I hadn’t heard about the “drama” surrounding this song during the Anthology sessions. Does anyone know the nature of George’s opposition to the song?