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Chicago is known for the sound of the electric blues, but long before Muddy Waters, Willie Dixon, Little Walter, and all the others plugged in, Chicago was an industrial center, home to foundries, transportation hubs, and animals headed through shuts to their slaughter. In the words of Carl Sandburg, the City of Broad Shoulders.  Emblematic of those shoulders are 27 or so bridges that tie one side of the Chicago River with the other.