Martin Luther King's I Have a Dream speech revisited

To mark the 50th anniversary of Martin Luther King's I Have a Dream speech, BBC Radio 4 asked notable figures to record a recital of the celebrated text.

The Dalai Lama, Stevie Wonder and Doreen Lawrence - mother of murdered teenager Stephen Lawrence - were among those who took part.

The broadcast also included audio from Dr King's original speech in Washington DC.

Listen to it in full here, and see striking images from a period of American history which became a tipping point for social change.

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