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In page Michael McDonald (musician):

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In 1999, McDonald recorded the song "Eyes of a Child" for the South Park: Bigger, Longer & Uncut, which is a comedic ballad written by Trey Parker. It was also used at the ending credits for the movie. The same year, he sang backing vocals on the Warren Brothers' single "Better Man", from their album Beautiful Day in the Cold Cruel World.[6] He also provided lead vocals for one of three studio tracks on Chicago XXVI: Live in Concert.