ELO's backstory is fascinating, I was listening to a podcast episode about it a few months back. They effectively came together out of the ashes of The Move, who were a 1960s British mod group who were one of those bands who were beloved by all the other musicians but didn't have chart success in America. Their success in the UK was also hampered by a manager who screwed them over left and right, most notably by putting a libelous caricature of the Prime Minister on the cover of what ultimately would be their best selling single which prompted the PM to sue them leading the group to lose all royalties for that song in perpetuity. By the early 70s the group went through lineup changes and Jeff Lynne came in as a guitarist, and they slowly converted themselves over into ELO.