Lore in short: Hundred Joyful Tidings and Pure Tone of Single Note is a risky project to create a unique superstructure modeled on how the two hemispheres of the brain work. It's a combined, powerful and large superstructure, divided into two separate consciousnesses, two different personalities, coexisting with each other.
Tidings is the equivalent of the right hemisphere. He approaches the tasks assigned to him with unconventional, creative methods, while his brother, who is also the second half of the project and the equivalent of the left hemisphere, is responsible for computational processes and mathematical calculations. They were fused, just like siamese twins.
My friend and I were once discussing how Note didn't have a puppet at first. His and his brother's creators simply decided not to grant him such a privilege because his work was purely computational, meaning a puppet wasn't necessary. Well...
That didn't stop Tidings from trying to contact him, even before he knew what his brother was like.