Alec Baldwin served up a double helping of impersonations during his appearance on Monday night's "Conan," singing some old school Jackson 5 to set up his impression of "30 Rock" co-star Tracy Morgan.
Baldwin, who returns for the sixth season of "30 Rock" on Jan. 12, said Morgan used to unwind in his dressing room by watching tapes of a young Michael Jackson.
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Watch his take on Morgan watching Jackson -- and Morgan's refusal to learn his lines:
