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30 Rock: Mamma Mia / Season: 3 / Episode: 21 (2009)
May 7, 2009
Liz concocts a Mamma Mia!-type scenario to help Jack find his father. Pete and Liz feel Tracy's illegitimate child is really a scam artist. Jenna reluctantly shares credit for a new TGS catchphrase with Liz.
performed by ABBA