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American Idol finale
By Reuters -

Singer Nick Fradiani performs after being named the winner during the American Idol XIV 2015 Finale at Dolby theatre in Hollywood, California May 13, 2015. REUTERS/Mario Anzuoni

Nick Fradiani is named the winner by host Ryan Seacrest (L), surrounded by fellow contestants. REUTERS/Mario Anzuoni

Nick Fradiani (R) reacts next to finalist Clark Beckham (C) after being named the winner. "American Idol", the most popular music reality show in U.S. television history, will end after its 15th season airs in January next year, Fox Television said. REUTERS/Mario Anzuoni

Audience members hold signs during the finale. The show was once a ratings powerhouse for Fox, watched by more than 30 million viewers at its peak, but the popularity of the competition, which launched the careers of stars such as Kelly Clarkson and Carrie Underwood, has fallen in recent years. REUTERS/Mario Anzuoni

Judge Jennifer Lopez waves. Once one of the highest-rated telecasts of the season, this year's "Idol" finale was down sharply from last year's conclusion, with an estimated 7.7 million viewers compared with last year's 10.6 million viewers. REUTERS/Mario Anzuoni

New Kids on the Block, (from L-R) Jordan Knight, Danny Wood, Donnie Wahlberg, Jonathan Knight and Joey McIntyre perform. The final season will feature long-time host Ryan Seacrest and current judges Jennifer Lopez, Keith Urban and Harry Connick, Jr, Fox said. REUTERS/Mario Anzuoni

Singer Janelle Monae performs. Fox, owned by Rupert Murdoch's Twenty-First Century Fox Inc, said in February last year that it expected to wind down American Idol after lower ratings led to a fall in advertising revenue in the company's TV unit. "We've known it's coming to the end," Chase Carey, president of 21st Century Fox, had said at the time. REUTERS/Mario Anzuoni

Judge Harry Connick, Jr. waves. A spin-off of British music competition "Pop Idol", which aired between 2001 and 2003, American Idol's success led the format being replicated around the world, with shows such as Australian Idol, Latin American Idol and Indian Idol. REUTERS/Mario Anzuoni

Singer Steven Tyler performs with contestant Jax. American Idol has since gone through a host of celebrity judges, such as Mariah Carey, Kara Dioguardi, talk show host Ellen DeGeneres and Aerosmith frontman Steven Tyler. REUTERS/Mario Anzuoni

Nick Fradiani (R) is named the winner by host Ryan Seacrest. REUTERS/Mario Anzuoni

Singer Janelle Monae performs. REUTERS/Mario Anzuoni

Donnie Wahlberg of New Kids on the Block performs in front of judges Harry Connick, Jr. (L), Jennifer Lopez and Keith Urban. REUTERS/Mario Anzuoni

Jamie Foxx performs. REUTERS/Mario Anzuoni

Singer Steven Tyler (center R) poses with the band Loving Mary as they arrive for the finale. REUTERS//Patrick T. Fallon

(L-R) Joey McIntyre, Donnie Wahlberg, Jonathan Knight, Danny Wood and Jordan Knight, of NKOTB (New Kids On The Block), arrive for the finale. REUTERS//Patrick T. Fallon

Singer Jamie Foxx and children pose for photos backstage during the finale. REUTERS//Patrick T. Fallon