Out of the Blue is the seventh studio album by the British rock group Electric Light Orchestra (ELO), released on October 28th, 1977.
Written and produced by ELO frontman Jeff Lynne, the double album is among the most commercially successful records in the group’s history, selling about 10 million copies worldwide by 2007.
It was one of the first pop albums to have an extensive use of the vocoder, and helped to popularize it