Alan Alda returns as Jack Donaghy's dad tonight on 30 Rock for the show's season finale, "Kidney Now." The plot finds Jack trying to put together a benefit concert for Alda, who is in need of a kidney. That, of course, means the ep will be loaded with appearances by famous musicians.
Guest stars include Elvis Costello, Mary J. Blige, Sheryl Crow, Maroon 5's Adam Levine and Clay Aiken. The clip below reveals some shocking truths about some of these famous crooners, including Aiken's relation to NBC page Kenneth Parcell.
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Musical guest stars galore on 30 Rock finale
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