John Legend has recorded a U2 song as a tribute to the late Martin Luther King.

The singer's version of the Irish rockers' classic 'Pride (In the Name of Love)' will be featured in 'King', a TV special about the prominent American civil rights campaigner.

The show - which will be broadcast on U.S. cable station History - also features interviews with U2 frontman Bono, Public Enemy's Chuck D and Harry Belafonte, all of which give their opinions on King.

King - who delivered the world-famous 'I Have a Dream' speech in Washington 1963 - was assassinated on April 4, 1968.

It was recently revealed Legend and Bono would be appearing together for the annual 'American Idol' charity concert.

The show, which is set to take place on April 9, will see Bono headline the event, with Legend, Snoop Dogg, Fergie, Annie Lennox and Mariah Carey also performing.

The concert will benefit underprivileged children and will hope to beat last's year's total of $76 million.