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A Box of Their Best is the first US box set by Electric Light Orchestra (ELO), released in 1980. It consisted of the albums A New World Record (with the sides reversed), Out of the Blue and Discovery. Also included was Jeff Lynne's first ever solo single, "Doin' That Crazy Thing". This single, a one-sided single that was marked as a promo, was not in all releases of the box. The box set is almost identical to the UK release Four Light Years, released the same year.