Spoilers, you want to finish VisionQuest before reading this one, but be sure to bookmark if a certain song sounds familiar.
Though he didn't write this one, Jonathan Coulton is known for his songs for killer robots thanks to actually writing Portal's "Still Alive" and "Want You Gone." So it makes perfect sense he be the one to bring to life the wonderful theme song of "Don't Kill the World." Another gem like VisionQuest's sister show Agatha All Along's "The Ballad of the Witches' Road," written by Oscar-winning composers Kristen Anderson-Lopez and Robert Lopez. You've heard their work throughout the MCU and many other places.
But, Jonathan got to use his pipes to belt out this catchy tune to an Ultron-infuriating theme song used to capture him in a sitcom about a couple of dudes trying to work out their grief. It's catchy as all Hell and perfectly fits as a request that Ultron kindly not kill us all.