 "Mr. Blue Sky" was the second single to be taken from "Out of the Blue", peaking at number 6 in the UK Singles Chart and number 35 in the US Billboard Charts.Due to its popularity and frequent use in multiple television shows and movies, it has sometimes been described as the band's signature song.In a BBC Radio interview, Lynne talked about writing "Mr. Blue Sky" after locking himself away in a Swiss chalet and attempting to write ELO's follow-up to "A New World Record"