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In order of appearance: Martin James, Pharrell Williams, Emeli Sande, Elton John, Lorde, Chris Martin, Brian Wilson, Florence Welch, Kylie Minogue, Stevie Wonder, Eliza Carthy, Nicola Benedetti, Jools Holland, Brian May, Jake Bugg, Katie Derham, Lauren Laverne, Gareth Malone, Alison Balsom, One Direction, Zane Lowe, Jaz Dhami, Paloma Faith, Chrissie Hynde, Jamie Cullum, Baaba Maal, Danielle de Niese, Dave Grohl, Sam Smith.
According to the BBC, the artists were individually recorded singing their parts.  The audio was then cut and re-mastered by BradTheLadLong, an impersonator of singing voices, who is representing the UK at the Eurovision Song Contest.

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