Common and John Legend gave a rousing performance of their song Glory - bringing some in the audience to tears - moments before the pair won an Oscar for the song written for the movie Selma.
Actor Chris Pine was among those brought to tears by the Oscar-winning song.
Selma chronicles Martin Luther King's campaign to secure equal voting rights through a march from Selma to Montgomery, Alabama in 1965.
In their acceptance speech, both Common and John Legend - real names Lonnie Lynn and John Stephens - spoke on the state of racial equality in the US. Legend said that there are more black men imprisoned in the US today than were enslaved in 1850, a poignant stat following the powerful performance.
Watch the trailer for Selma
Selma also is nominated for Best Picture.
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