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X Ambassadors: Meet the heir to Imagine Dragons in training

Judging by X Ambassadors brief seven-song Summerfest set at a well packed U.S. Cellular Connection Stage early Thursday evening, there's still some work to be done before the band officially earns the title of Top 40 rock heir apparent. However, the potential is most certainly there, and by the end of the rockers' setlist, it was on full display.