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Wilco, American band led by singer-songwriter Jeff Tweedy that spun off from the group Uncle Tupelo in the mid-1990s and evolved from its alternative country roots into one of the most successful and multifaceted rock groups of its time. Following the bitter breakup of Uncle Tupelo, which had been based in Belleville, Illinois, near St. Louis, Missouri, cofounder Jeff Tweedy relocated to Chicago. Tweedy was joined there by former Uncle Tupelo members drummer Ken Coomer,...