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In 1984, Tracey Ullman released the single, "They Don't Know," a song originally written and sung by Kristy MacColl in 1979. During the recording of the song, MacColl actually sang backup vocals in Ullman's version. The song reached number 8 on the Billboard Hot 100 in the United States.
Tracey Ullman is a British comedian, singer, author, and actress known for her spot-on celebrity impersonations. She is also know for her variety shows, especially The Tracey Ullman Show, which aired in the United States from 1987 to 1990. Ullman has received numerous awards for her work, including seven Emmys and a Golden Globe.