This is #day669 of my #1001albumsyoumusthearbeforeyoudie challenge, and… this was actually my first-ever time listening to an ELO album, let alone "Mr. Blue Sky," which I wasn't even aware of. My initial thought was something like, if Muse had formed in the '70s, this is probably what they would've sounded like. I mean, they also have a song called "Starlight," right? Anyway, this is a very late '70s record. The progressive side of the music shines through, while the pop sensibilities are... orchestrating, literally. The futuristic electronic backbone is fun, and so is the use of the vocoder. It's kind of like, "Hey, here's a new toy. What if we use it throughout the whole record?" At first, I thought it was too long, but putting my thoughts together, I think the length is justified. Times were different. People made big albums, you see. Better yet, you had to sit through them. Right to the very end. I think it's historically important work. This is a 4 out of 5. Looking forward to #day670.