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FILE - In this Feb. 16, 2014 file photo, Pharrell Williams rehearses before the NBA All Star basketball game in New Orleans. The producer-rapper-singer’s tune “Happy” is nominated for best original song at the Oscars on Sunday, March 2, 2014. Days ahead, the upbeat anthem has climbed to No. 1 on the Billboard Hot 100 chart. (AP Photo/Bill Haber)

Pharrell, U2, Idina Menzel rock Oscar rehearsals

By SANDY COHEN - Associated Press

FILE - In this Jan. 26, 2014 file photo, Pink performs at the 56th annual Grammy Awards at Staples Center, in Los Angeles. Producers of the 86th Academy Awards announced Friday, Feb. 21, 2014, that Pink will appear on the Oscar show. The Grammy-winning singer joins a lineup already set to include performances from U2, Pharrell Williams, Bette Midler, rocker Karen O and Broadway star Idina Menzel. (Photo by Matt Sayles/Invision/AP, file)

Pink joins lineup of pop artists on the Oscars

Associated Press

FILE - This Feb. 12, 2012 file photo shows songwriter Robert Lopez backstage with his award for best musical theater album for &quot;The Book of Mormon&quot; at the 54th annual Grammy Awards in Los Angeles. Lopez, who helped create &quot;Avenue Q&quot; and &quot;The Book of Mormon,&quot; is up for an Academy Award next month along with his co-writing partner and wife, Kristen Anderson-Lopez, for best song for &quot;Let it Go&quot; from the animated film &quot;Frozen.&quot; (AP Photo/Mark J. Terrill, File)

Robert Lopez on upcoming Oscars, TEDx talk

By MARK KENNEDY - Associated Press

Karen O to debut opera at The Creators Project

By ASSOCIATED PRESS - Associated Press