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Keith Urban, from left, Jennifer Lopez, Harry Connick, Jr. and Ryan Seacrest. "American Idol" will begin its 15th and farewell season with a special two-night, four-hour premiere event Wednesday, Jan. 6, 2016, and Thursday, Jan. 7.

Keith Urban, from left, Jennifer Lopez, Harry Connick, Jr. and Ryan Seacrest. "American Idol" will begin its 15th and farewell season with a special two-night, four-hour premiere event Wednesday, Jan. 6, 2016, and Thursday, Jan. 7.