The main reason for the rather dramatic practice of foreshortening the duration of many singles back in the day was, of course, largely down to the need to fit in with radio playlists where no more than four minutes was thought to be the optimum requirement for maximum audience impact with the added benefit that listeners would buy the album too to hear the song at its full length.
The reduction in the playing time of many Electric Light Orchestra singles was discussed in a previous 2018 elobeatlesforever (elobf) article entitled: Singled Out: The Edited Light Orchestra wherein elobf compared several single edits against their album counterparts. Here's what this writer considers to be the top five ELO singles most impacted by their amputation for the 7" format ...
"Evil Woman" (US/Fr) from 4:28 to 3:15
"Can't Get It Out Of My Head" (UK/US) from 4:26 to 3:06
"Boy Blue" (US) from 5:17 to 2:53
"Mr. Blue Sky" (NL) from 5:05 to 3:44
"Roll Over Beethoven" (UK/US) from 8:05 to 4:30
Related elobf articles
Singled Out: The Edited Light Orchestra
Singled Out: The Electric Light Orchestra (No Answer)
*** Until next "Time" in the elobf universe ... KJS ... 11-Feb-2020 ***