Their sixth album, the platinum selling A New World Record, became their first UK top ten album when it was released in 1976. It contained the hit singles "Livin' Thing", "Telephone Line", "Rockaria!" and "Do Ya", a re-recording of the Move song. The band toured in support in the US only from September 1976 to April 1977 with a break in December, then an American Music Awards show appearance on 31 January 1977, plus a one-off gig in San Diego in August 1977. Casey Kasem said that the Electric Light Orchestra is the "World's first touring rock 'n' roll chamber group" before he played "Livin' Thing" at #28.
A New World Record was followed by a multi-platinum selling album, the double-LP Out of the Blue, in 1977. Out of the Blue featured the singles "Turn to Stone", "Sweet Talkin' Woman", "Mr. Blue Sky", and "Wild West Hero", each becoming a hit in the United Kingdom. The band then set out on a nine-month, 92-date world tour, with an enormous set and a hugely expensive space ship stage with fog machinesand a laser display. In the United States the concerts were billed as The Big Night and were their largest to date, with 62,000 people seeing them at Cleveland Stadium. The Big Night went on to become the highest-grossing live concert tour in music history up to that point (1978). The band played at London's Wembley Arena for eight straight sold-out nights during the tour, another record at that time.
In 1979, the multi-platinum album Discovery was released, reaching number one on the UK Albums Chart. Although the biggest hit on the album (and ELO's biggest hit overall) was the rock song "Don't Bring Me Down", the album was noted for its heavy disco influence. Discovery also produced the hits "Shine a Little Love", their first and only no. 1 hit from 1972 to the present with any of the 4 major or minor US singles charts on Radio & Records (R&R), "Last Train to London", "Confusion" and "The Diary of Horace Wimp". Another song, "Midnight Blue", was released as a single in Southeast Asia. The band recorded promotional videos for all the songs on the album.