This song closed the side of the album known as "Concerto For A Rainy Day." The lyrics are uplifting, and follow the concept of a rainy day that comes to an end.
On a BBC Radio interview, Jeff Lynne talked about how he came up with this after he locked himself away in a Swiss chalet attempting to write ELO's follow-up to A New World Record. "It was dark and misty for two weeks, and I didn't come up with a thing. Suddenly the sun shone and it was, 'Wow, look at those beautiful Alps.' I wrote Mr. Blue Sky and 13 other songs in the next two weeks."
ELO leader Jeff Lynne puts "Blue" in a lot of his songs... "Mr. Blue Sky," "Out of the Blue," "Midnight Blue," etc. Lynne is from the Birmingham area in England, where the Birmingham Football Club (or as Americans know it, soccer team) is called the Birmingham Blues. The "blues" in these songs are a tribute to his team. (thanks, Kenth - Northford, CT)
The synthesized voice at the end of the song sings, "Please turn me over" because in the old days when we used to listen to our music on vinyl, we had to turn the record over to hear the other side. (thanks, Steve - Perth, Australia)
In 2003, this was featured in commercials for the Volkswagen convertible Bug. The spot showed a man slogging through his work day until he stops to look out a window and sees what's out there. The song was also used in commercials for Sears.
This is played before the start of every football (soccer) match played by Birmingham City Football Club (nickname: "The Blues"). Many fans of the club associate the song with a former player (and later Manager), Trevor Francis, who - through his association with the club in the '70s - was believed to be friends with Jeff Lynne (a supporter). (thanks, Steve - Birmingham, England)
This was used as the theme song to the short-lived series on NBC called LAX. It starred Heather Locklear and Blair Underwood as the runway and terminal managers, respectively. (thanks, Rene - Sacramento, CA)
This song was used in the Jim Carrey movie Eternal Sunshine of the Spotless Mind and is also featured in the movie Martian Child with John Cusack. (thanks, Thomas - Marion, IN)
Jeff Lynne and Richard Tandy of ELO performed this song with Ed Sheeran at the Grammy Awards in 2015. ELO, which never won a Grammy, had returned to action in 2014 with a concert at Hyde Park in London.
According to data provided by music discovery app Shazam, Lynne, Tandy and Sheeran's performance provided the most Shazamed moment of the entire telecast.