Music stars Sir Paul McCartney and Michael Jackson are to swap vocals as a new remix and video of their duet, Say Say Say, is unveiled – 32 years after its original release.

McCartney’s chief engineer Steve Orchard and Mark `Spike’ Stent, who has worked with Madonna, U2 and Beyonce, have remixed the latest version of the song, which features previously unheard vocals from Jackson, who died in June 2009 at the age of 50.

The extended track – which is over three minutes longer than the original 1983 single – opens with Jackson rather than McCartney, and is featured in the re-issued edition of his Pipes Of Peace album.

Orchard said: “Paul remembered that there were two unused lead vocal performances by Michael and himself. We rearranged the vocal sequence and inverted the original performance so that Michael opened the first verse instead of Paul, to give the song a different take to the original version.”

The single’s accompanying video, which launched at 4pm on McCartney’s Facebook page, has been created by Ryan Heffington, who has worked with Sia and Lady Gaga.

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