Yeah Yeah Yeahs front woman Karen O performs her tender ballad 'The Moon Song' from the film HER.
The multi-talented Pharrell Williams performs his upbeat song 'Happy' from DESPICABLE ME 2.
On February 20, 27-year-old assistant cameraperson, Sarah Jones was killed in a train accident near Savannah, Georgia, on the set of the film MIDNIGHT RIDER.
The pop star will make an appearance at the Dolby Theatre.
See the highlights from the 2014 Oscars.
Oscar.com gives you an inside look into the making of this moving nominated film. Watch the exclusive interview from the Academy screening with the cast and filmmakers.
On Monday, the complete slate of stars who will present Oscars at the ceremony were announced.