Yes, that's what is happening here, a GOAT playing a Massive Modular Synthesizer from the comfort of its own pen. From the youtube channel of thenervoussquirrel, who is presumably the goats owner, this video features a hardy and durable controller affixed to the pen of a goat, who is joyously crafting his next experimental sound work. Presumably the goat will be setting up a Soundcloud / Bandcamp page in the coming weeks.
Here's an owl Theremin from the same channel.
More from the https://www.nervoussquirrel.com/
About the author [midierror]: midierror makes nifty Max For Live devices, innovative music hardware, award winning sample packs and hosts a podcast speaking to people in the music world.