From the introduction:
Band Together was created as part of Game Chef 2014. The theme, There Is No Book, inspired us to explore RPGs that aren’t based on words at all. Instead, the game is based on sounds, and making pleasing songs together.
Both Pete and Jasmine have improv background, and Jasmine is specifically interested in musical improv. She drew from these roots, using one of her favorite exercises, the soundscape, to create the seed that became Band Together. Pete is responsible for creating the rules to turn this from "Screwing Around in Garage Band: The Game" into something that can actually be playable as a storytelling game.