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Mattefs and wife Amy at Wrigley Field, opening weekend 2014.

From Fergie to Ozzy, Chicago-native Tim "Grape" Mattefs has traveled the world as a touring live concert technician. But the lifelong Chicago Cubs fan has never experienced a live performance at Wrigley Field, until now. In the midst of a massive world tour with Australian rock and roll giants AC/DC, Mattefs will take the field of the "friendly confines" on Tuesday for a sold-out rock show of the ages.

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Julie Frost

Last month, she won a Golden Globe award with Madonna. And she's written hit songs for The Black Eyed Peas, Beyonce and others. We talk with a longtime Chicago singer-songwriter whose career is flying high.

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