Tropic Thunder stars Ben Stiller, Jack Black and Robert Downey Jr. play the Pips singing backup on "Midnight Train to Georgia" for Gladys Knight during the season Finale of American Idol Season 7.
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Tropic Thunder stars Ben Stiller, Jack Black and Robert Downey Jr. play the Pips singing backup on "Midnight Train to Georgia" for Gladys Knight during the season Finale of American Idol Season 7.