Enda Brady: UK correspondent on the Beatles' final song 'Now and Then' being released tomorrow - Heather du Plessis-Allan Drive

After years in the making, the Beatles are set to release their musical farewell to the world.

'Now and Then' features all four members on the track, and will be the last song credited to Lennon, McCartney, Harrison and Starr.

The song is being released Friday and the video debuts on Saturday.

UK correspondent Enda Brady says this song has been 45 years in the making, with AI enhancing the final product.

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